Friends (1994) - 891 mistakes in entire show
starring Courteney Cox, David Schwimmer, Jennifer Aniston, Lisa Kudrow, Matt LeBlanc, Matthew Perry (add more)
The One with the Blackout (series 1, episode 7)
The One Where Nana Dies Twice (series 1, episode 8)
Other: When Ross is helping choose a dress and shoes for Nana to wear, he is behind the chest of drawers in the cupboard. He looks in a shoebox and finds lots of pink tickets, then pulls down another box and lots of tickets fall down on him. However, it is obvious that someone is above him showering tickets down, as they are coming from directly above him, not from on top of the door.
The One Where Underdog Gets Away (series 1, episode 9)
Continuity: Chandler is able to get into Monica's apartment to tell everyone that Underdog got away, but later when Rachel closes the door it is now locked. We can see the door as each person is leaving and nobody does anything which could be construed as locking the door before it closes. It's been often demonstrated in the show that the door doesn't lock automatically.
Revealing: Whenever Monica's apartment is shot from the point of view of the balcony looking in, fake walls have to be put up across the room to cover the open space (since there is no wall there usually). When the friends are looking out the window at Ugly Naked Guy and his girlfriend in this episode, you can see that the rear wall does not extend nearly far enough - there is a large black space behind Monica.



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