Trivia: The Simpsons holds the record for most guest stars; it is also the only non-variety show to have had appearances from three former Beatles (Paul, George and Ringo).
Trivia: Carrie is the only main character who never appears nude (she is either dressed or covered by something). Sarah Jessica Parker had a strict "no nudity" clause in her contract.
A Deadly State of Mind - S4-E6
Trivia: Unusually enough for a television show devoted to a homicide detective and the way he unravels the plans of cunning murderers, the fact is that Columbo has nothing to do in this episode. Doctor Collier is seriously assaulted by Carl Donner who then goes on to violently attack his wife. Use of deadly force to prevent such an attack is allowed in the United States. Collier does not commit murder; he doesn't even commit a crime. You'd think such a hightly educated man would know enough to keep his head, call the police and explain what had happened. He wouldn't even be charged.
Trivia: It's in this episode that the Heimlich Maneuver is used for the first time by the paramedics. At the USC game, when a guy is choking on a hot dog, John and Roy are called, and John uses the Heimlich. Up until season 6 we've seen the guys use other methods, such as the ChokeSaver which look like huge white tweezers, to remove obstructions in an airway, as seen in 4x9, "Foreign Trade."
Trivia: Matthew Perry's wit is so legendary that the scriptwriters have often incorporated his gags into the show.
The Holographic Excitation - S6-E5
Trivia: In this episode, Sheldon and Amy are trying to decide on couples' themed Halloween costumes. Sheldon is standing in front of the dry erase board. There are 2 columns written on the board. One named "Couples I Like" and the other "Couples You Like." Under the "Couples You Like" column, one of the couples is Blossom and Joey. Blossom is the name of the television character played by Mayim Bialik in the 90s and Joey was one of her brothers.
Trivia: Frank dresses up as Frankenstein in this episode for an in-joke alluding to the role he played in 1974's Young Frankenstein.
Trivia: Ted Cassidy, best known for his role as Lurch in the hit TV series "The Addams Family", did the opening narration for the show as well as the vocal effects for the Hulk. Sadly, Ted Cassidy died during production of Season 2. The Hulk's vocal effects were then done by actor Charles Napier for the rest of the show. Ted Cassidy's voice was still used for the opening narrations of all seasons.
Trivia: Although Len Cariou plays Tom Selleck's father, he's only five years older than Selleck.
Band Candy - S3-E6
Trivia: The accent that Giles uses as his teenage self is Anthony Head's natural accent.
Trivia: John Mahoney plays Kelsey Grammer's father in the series, even though in real life he's only 15 years older than Grammer.
Trivia: Gene Roddenberry created the transporter as an easier (and cheaper) way of getting Enterprise crew members onto a planet's surface, rather than landing the ship on the planet.
One Henry, Three Girls: Part 1 - S2-E2
Trivia: When Kid Danger and Veronica are about to kiss in the park, the old man who stop them is holding a book called "Good Burger." The show's writer, Dan Scheider also wrote for the show Good Burger.
Trivia: When Al and Peg are in the video store looking for a movie to rent, the video store is giving away free copies of the movie Dutch. Dutch is a comedy that starred Ed O'Neill.
Trivia: Ben Sullivan, Dr. Cox's best friend and brother-in-law, loves his camera and takes pictures everywhere he goes. Brendan Fraser, who plays Ben, has a great interest for photography in real life.
Trivia: Katie Holmes is the only actor/actress who appears in every episode
The Mainland - S3-E4
Trivia: When Father Ted sees actor Richard Wilson from the hit TV series "One Foot In The Grave", Father Ted goes up behind Richard and says "I don't believe it." causing Richard to attack him. Richard Wilson has admitted that he really does hate when people come up to him and says his character's well known phrase.
Goodbye (1) - S2-E4
Trivia: The first episode to air following John Ritter's death, it was filmed without a laugh track or live studio audience.