1. "Friends"
   "Saved by the Bell"
2. "Seinfeld"
   "Frasier"

As with any show, various actors were looked at to play the six friends who became the staple of the show "Friends." One unique switch actually involved two of the actresses who were cast: Courtney Cox and Jennifer Aniston. Showrunners wanted Cox to play Rachel, but Cox refused as she better identified with Monica.

1. "Dawson's Creek"
   "Beverly Hills, 90210"
2. "My So-Called Life"
   "Party of Five"

Actors are known for hiding their age, and that's exactly what Gabrielle Carteris did to be cast as 16-year-old Andrea Zuckerman. In reality, she was 29 years old, which made her the oldest cast member out of the teenagers on "Beverly Hills, 90210."

1. "Buffy the Vampire Slayer"
   "The X-Files"
2. "Twin Peaks"
   "Are You Afraid of the Dark?"

When Chris Carter started developing the idea for "The X-Files," he was largely influenced by the 1991 film "The Silence of the Lambs." He went as far as to make sure the actress who played Dana Scully, Gillian Anderson, had red hair to match the hair of Clarice Starling from the film.

1. "Seinfeld"
   "Frasier"
2. "Home Improvement"
   "Roseanne"

Kramer was a fan favorite character on "Seinfeld," evident by the applause he always got when he made an entrance into a scene. The applause eventually got so drawn out that the audience was asked to hold it back to keep it from affecting the pacing of the scenes.

1. "Family Guy"
   "Rocko's Modern Life"
2. "The Simpsons"
   "The Ren & Stimpy Show"

Despite its high success, "The Simpsons" definitely had its critics. One of those critics was Barbara Bush, the first lady during the show's first few years. While giving a speech in 1992, Bush stated that she wanted American families to be "more like the Waltons and a lot less like the Simpsons."

1. "Freaks and Geeks"
   "Twin Peaks"
2. "Legends of the Hidden Temple"
   "Sister, Sister"

Before creating "Twin Peaks," David Lynch and Mark Frost wrote a movie script about Marilyn Monroe that proposed the possibility that Monroe's death was caused by the Kennedys. The movie was never made, but they were able to incorporate parts of it into the story for "Twin Peaks."

1. "The West Wing"
   "Trauma: Life in the E.R."
2. "Chicago Hope"
   "ER"

The pilot episode of "ER" was shot at a supposedly haunted hospital called the Linda Vista Hospital in Los Angeles. It was the only episode shot at this location, as the remaining episodes were shot at Warner Bros. Studio.

1. "Cheers"
   "Will & Grace"
2. "Home Improvement"
   "Frasier"

The theme song for "Frasier," written by Bruce Miller, was sung by the lead actor in the series, Kelsey Grammer. The song was written to be somewhat oblique, not directly referencing the fact that Dr. Crane worked as a psychiatrist.

1. "Boy Meets World"
   "Full House"
2. "The Fresh Prince of Bel-Air"
   "All That"

Prior to joining "The Fresh Prince of Bel-Air," Will Smith made a large chunk of money when he released an album in 1988. The only problem was that he didn't pay his taxes on the money he earned. Luckily, he landed the role on "The Fresh Prince of Bel-Air," which saved him from the IRS.

1. "Boy Meets World"
   "Clarissa Explains It All"
2. "Dawson's Creek"
   "Saved by the Bell"

"Saved by the Bell" ran for four seasons and 86 episodes, ending in 1993. Though the show featured several child stars, only Mark-Paul Gosselaar, Mario Lopez and Dustin Diamond appeared in every episode.

1. "Are You Afraid of the Dark?"
   "Buffy the Vampire Slayer"
2. "Freaks and Geeks"
   "Sabrina the Teenage Witch"

The vampires in "Buffy the Vampire Slayer" have a horrific look when they transform as they prepare to feed. The creator of the show, Joss Whedon, desired this look because he didn't want a teenage girl running around stabbing people who looked normal.

1. "Hey Arnold!"
   "Dawson's Creek"
2. "Family Matters"
   "Boy Meets World"

"Boy Meets World" was known for its many disappearing characters, from Cory's early friends to members of Topanga's family. However, one of the strangest disappearing acts was Mr. Turner, who never came back to the show after he was in an apparent life-threatening accident.

1. "Animaniacs"
   "Hey Arnold!"
2. "Rugrats"
   "Doug"

Though three of the four main babies were boys, all of the babies were voiced by women. This decision was made because the children were supposed to have high-pitched voices to accurately resemble children.

1. "Beverly Hills, 90210"
   "Family Matters"
2. "In Living Color"
   "Full House"

It's hard to imagine "Full House" without its lead actor, Bob Saget. However, Saget didn't play Danny Tanner in the original pilot because he was currently on "The Morning Program." When Saget was fired from the job, the pilot was reshot with Saget in the lead role.

1. "Clarissa Explains It All"
   "My So-Called Life"
2. "Blossom"
   "The Adventures of Pete & Pete"

When Mitchell Kriegman went about creating "Clarissa Explains It All," he created a 52-page book recognized as the show's Bible. The book gave writers guidelines to follow as they wrote episodes, including catchphrases, character descriptions and how video effects worked.

1. "Freaks and Geeks"
   "Sabrina the Teenage Witch"
2. "Are You Afraid of the Dark?"
   "Legends of the Hidden Temple"

Originally, Nickelodeon bosses didn't want to make "Are You Afraid of the Dark?" because they didn't believe in scaring children on their network. However, the network hired executive Jay Mulvaney later in the year, and he took interest in the script, which led to the creation of the show.

1. "All That"
   "Saturday Night Live"
2. "In Living Color"
   "The Ren & Stimpy Show"

The late comedian Chris Farley was part of a famous sketch on "All That" where he completely destroyed the set with condiments in a back and forth mess with Keenan Thompson. His decision to destroy the set was based on his desire to film it in one take since the crew couldn't reset when it was over.

1. "Dawson's Creek"
   "Freaks and Geeks"
2. "Party of Five"
   "My So-Called Life"

The school scenes for "My So-Called Life" were filmed at a high school in Los Angeles called University High School. While filming during the school year, regular classes were moved to certain parts of the school for the filming to take place. Clearly, University High School was dedicated to the arts.

1. "Freaks and Geeks"
   "Family Matters"
2. "The Secret World of Alex Mack"
   "Kenan & Kel"

"Family Matters" was a spinoff of the series "Perfect Strangers," with Harriette Winslow being the carryover character between the two shows. Surprisingly for a spinoff, "Family Matters" ran a season longer than its predecessor.

1. "Sister, Sister"
   "Blossom"
2. "Dawson's Creek"
   "That '70s Show"

Prior to creating "Dawson's Creek," Kevin Williamson wrote the horror film "Scream" and "I Know What You Did Last Summer." To hint at his previous work, Williamson often incorporated props from these films into Dawson's own world.

1. "Home Improvement"
   "Party of Five"
2. "Roseanne"
   "The Adventures of Pete & Pete"

In "Home Improvement," Tim Taylor has three children: Brad, Randy and Mark. Brad is portrayed as the oldest of the three in the show, but in real life, Randy, played by Jonathan Taylor Thomas, was actually older than Brad, who was played by Zackery Bryan.

1. "Mad About You"
   "The Adventures of Pete & Pete"
2. "Sister, Sister"
   "Kenan & Kel"

In the early seasons of "Sister, Sister," the twins would often break the fourth wall to talk directly to the audience. However, this decreased substantially when the show moved from ABC to the WB and was completely removed by the sixth season.

1. "The Secret World of Alex Mack"
   "Sabrina the Teenage Witch"
2. "Ally McBeal"
   "Blossom"

The idea for "Sabrina the Teenage Witch" came from an Archie Comics issue from 1962 titled "Madhouse #22." The character would continue to appear in the comic until she received her own title in 1971.

1. "Doug"
   "Rocko's Modern Life"
2. "Recess"
   "Animaniacs"

Making its premiere in 1991, "Doug" was one of the first three cartoons that Nickelodeon ever aired on its network. Prior to the airing of these cartoons, Nickelodeon had been on the air for 12 years without any cartoons, which is hard to image considering what the network is today.

1. "In Living Color"
   "Kenan & Kel"
2. "That '70s Show"
   "Saturday Night Live"

"Saturday Night Live" is known for launching the careers of some of the biggest names in comedy since it started in 1975. The '90s were no different, as stars like Chris Farley, Will Ferrell, Adam Sandler and Norm Macdonald all made appearances on the show during the decade.

1. "Pinky and the Brain"
   "Animaniacs"
2. "Tiny Toon Adventures"
   "Freakazoid!"

Steven Spielberg, one of the biggest names in the entertainment industry, served as the producer of "Animaniacs," the second animated series he ever produced. Spielberg's previous work included directing movies like "Jaws," "Raiders of the Lost Ark" and "E.T. the Extra-Terrestrial."

1. "Kenan & Kel"
   "The Amanda Show"
2. "Blossom"
   "That '70s Show"

The two actors who played Keenan and Kel, Keenan Thompson and Kel Mitchell, made Nickelodeon history as the first two African American leads on one of their shows. They had previously been cast members on "All That," but that show featured an ensemble cast.

1. "Roseanne"
   "Cheers"
2. "Mad About You"
   "Will & Grace"

While most shows use multiple directors to oversee different episodes, "Will & Grace" relied on the watchful eye of James Burrows for its entire run. Burrows was the co-creator of the series "Cheers" and worked as a director on shows like "NewsRadio" and "Third Rock from the Sun."

1. "Rocko's Modern Life"
   "The Angry Beavers"
2. "Hey Arnold!"
   "CatDog"

Matt Groening, who created "The Simpsons," was an important influence on the way Craig Bartlett went about creating his characters. Groening told Bartlett to design characters that could be recognized from far away, which is probably a major reason Arnold has a football-shaped head.

1. "Roseanne"
   "The Adventures of Pete & Pete"
2. "The Nanny"
   "Step by Step"

"Roseanne" got a reboot in 2018 titled "The Connors," which featured many of the original cast members. However, the show was retooled the same year after the lead actress, Roseanne Barr, posted insensitive comments on Twitter.

1. "In Living Color"
   "Cheers"
2. "Xena: Warrior Princess"
   "That '70s Show"

Topher Grace, who played Eric Forman in "That '70s Show," was discovered by the show's creators while performing in a high school production of "A Funny Thing Happened on the Way to the Forum." The creators, Bonnie and Terry Turner, were at the play watching their child perform when Grace stole the show.

1. "Batman Beyond"
   "Batman: The Animated Series"
2. "Superman: The Animated Series"
   "Spiderman: The Animated Series"

The creation of "Batman: The Animated Series" led to the discovery of the Joker's most legendary voice actor, Mark Hamill. Hamill had previously starred in the original "Star Wars" trilogy but was able to rebrand himself as a voice actor by taking on this role.

1. "Homicide: Life on the Street"
   "New York Undercover"
2. "Law & Order"
   "NYPD Blue"

In many ways, "Law & Order" was the first of its kind, going on to inspire several spinoff series. The show created a basic formula for these series where the first half of the show is about the investigation of a crime while the second half is about the prosecution.

1. "Hercules: The Legendary Journeys"
   "Legend of the Seeker"
2. "Xena: Warrior Princess"
   "The Adventures of Sinbad"

Prior to getting her own series, Xena was a character on "Hercules" who was actually supposed to die after a three episode arc. However, producers fell in love with the character and , instead, decided to create a spinoff series based on her.

1. "Dexter's Laboratory"
   "Johnny Bravo"
2. "The Powerpuff Girls"
   "Ed, Edd n Eddy"

"Dexter's Laboratory" was a revolutionary part of Cartoon Network's history because the show was the first original animated cartoon series on the network. It received this honor after winning the popular vote in a short series contest.

1. "The Nanny"
   "Mad About You"
2. "Ned and Stacey"
   "Dream On"

For the longest time, "Mad About You" was only known as "The Paul Reiser Project," and representatives for Paul Reiser wanted it to carry his name. However, executive Warren Littlefield expressed that the show was about a couple and not a single person, and "Mad About You" became the title.

1. "Pokemon"
   "Digimon Adventure"
2. "Yu-Gi-Oh!"
   "Monster Rancher"

Pikachu might be the most famous Pokemon in the animated series, but it wasn't intended as Ash's original Pokemon. Instead, Clefairy was supposed to hold this title, which would have matched the comic books. However, Pikachu was viewed as more appealing to younger viewers, and thus, the cultural icon began.

1. "Martial Law"
   "Nash Bridges"
2. "Diagnosis: Murder"
   "Walker, Texas Ranger"

After nearly 20 years, "Walker, Texas Ranger" is finally getting a reboot. In the new show, Jared Padalecki will star as Cordell Walker. Padalecki had previously played Sam Winchester in the long-running series "Supernatural."

1. "MacGyver"
   "Baywatch"
2. "Pensacola: Wings of Gold"
   "Melrose Place"

Michael Newman, who played a character with his real name in "Baywatch," was an actual lifeguard in real life. Newman influenced the show by not only providing knowledge on how to perform the duties of a lifeguard but also by providing stories from his experiences for the plot.

1. "Family Guy"
   "Futurama"
2. "South Park"
   "King of the Hill"

With adult-oriented content never seen before, "South Park" was an immediate hit from the moment it first aired. Since then, the show has run for over 20 seasons, and the creators have used the style to make numerous movies including "South Park: Bigger, Longer & Uncut" in 1999.