Trivia: There is only one season where Janice never appears even once: the sixth (she does, however, make a pseudo-appearance when her voice pervades the mixed tape Chandler finds for Monica in the episode where they "make" each other Valentine's Day gifts).
Trivia: The spare room (Rachel's) in Monica's apartment has a wall right opposite the door, which serves absolutely no purpose except to block the view into the room from the living room. The bedroom set isn't always built, just when needed, so having that wall makes life much easier. It's completely illogical though, as it's too thin to be a supporting wall, and where it is makes getting into the room a pain.
Add timeJon Sandys
Trivia: Virtually the only time that any apartment doors are locked is when it is important to the episode. For example, Monica's apartment door is always unlocked, even when they go out or she and Chandler are having sex, but in "The One Where Underdog Gets Away" (series 1), it's locked when there is all the "got the keys?" business. Also, Ross' apartment is never locked, except for in "The One With Phoebe's Birthday Dinner" (series 9), when they lock Emma in, and in "The One With The Engagement Picture" (S7 E4) when Phoebe has the key and unlocks the door, then Ross demands it back.
Trivia: Phoebe's twin sister "Ursula" actually existed before Phoebe, as a character in another U.S. sitcom, Mad About You. In the first part of "The One With Two Parts," the two characters who come into Central Perk, thinking Phoebe is Ursula, are regular characters from that show.
Trivia: Many famous people are mentioned in the show and some end up guest starring! Two examples of this include Ross's List from Series 3, which includes Winona Ryder, who guest stars as Rachel's friend in Series 7. Also, Joey and Ross mention their favourite movie is Die Hard, and Bruce Willis guest stars in Series 6 as Ross's girlfriend's dad ("Hey, Mr. Stevens, you look like that guy out of Die Hard!"). That is also true for Susan Sarandon and Elle MacPherson.
Trivia: In "The One Where Rachel Tells Ross", originally shot before September 11, 2001, Chandler and Monica couldn't get on their flight for their honeymoon because Chandler said the word "bomb" in the airport. After the terrorist attacks on the U.S., the story was rewritten and re-shot. The original scenes for this story can be seen on the DVD.
Trivia: Rachel is the only friend to kiss all of the other five. Monica: to get their apartment back; Phoebe: so Phoebe could see how good a kisser Rachel was; Ross: well we all know that story!; Chandler: to hide that he and Monica were dating had to kiss all three girls after he made the mistake of just kissing Monica goodbye; Joey: the two briefly dated and first kissed in Barbados.