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In "The one with Ross's Wedding" (part one) there is a brief shot of Chandler and Joey on the top of the double decker bus. The man and the woman seated behind them is Adam Chase and Marta Kaufman, who both work on the show. See more...
Friends (1994) - 168 mistakes in season 1
starring Courteney Cox, David Schwimmer, Jennifer Aniston, Lisa Kudrow, Matt LeBlanc, Matthew Perry (add more)
Continuity: The number of the flats near the start of the first series was 4 and 5. After a few shows they changed to 19 and 20. [The producers realised that the numbers 4 and 5 were for apartments on the lower floors and had shown Monica's apartment to be much higher up so they changed the numbers - it's still a mistake but there's the reason.]
Plot hole: When Rachel arrives to Central Perk, Monica introduces her to everybody, including to Chandler, as if they don't know each other. In later episodes, we learn that Chandler, Monica and Rachel knew each other in high school. Even Chandler kissed Rachel once, and since Chandler always says that he hasn't kissed many women, he should have perfectly remembered Rachel, and Monica should have known that the two of them knew each other.
Continuity: When we first see Ross at the museum, the woman he works with is holding a rock. In the first shot, she is holding onto it with her right hand at the bottom and just before the shot changes she turns away from Ross. In the next shot, she is facing Ross again and her right hand has moved on top of the rock.






