Joey: Ducks is heads, because ducks have heads.
Chandler: What kind of scary-ass clowns came to your birthday?
Rachel's sisters are called Jill and Amy. These are the same names as the co-producers of the show. See more...
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Visible crew/equipment: When Ross is on the balcony trying to comfort Rachel after she has split up with Paolo, we see a couple of shots from the balcony looking into Monica's apartment. If you look at the top of the screen you can see where the walls of the set end, and all the stage lights hanging from the ceiling of the studio.
Continuity: In the scene where Ross and Carol are talking and Carol says that all he needs is to find a woman who likes men, a woman comes across the room walking in high heels. The shot is wrong because we see her up until she's half the way through the table, and the next shot shows her four steps back.