Corrected entry: In the last scene of the episode when the friends are sitting on the sofa in Central Perk, Ross has the ice on his forehead because he hit it on the machine in the launderette. At first Rachel is holding it on Ross' head, then in another shot Ross is holding it, then Rachel again, and then in the final shot Ross is holding it. It may be that they did keep switching but it's unlikely and looks more like the scene was filmed twice and the mistake was made when it was edited.
Corrected entry: When Janice comes into the coffee shop to talk to Chandler, she brings several shopping bags which she sets by the couch. But when she gets back from the restroom and Phoebe breaks up with her for Chandler, she leaves the coffee shop without getting her bags from in front of the couch.
Corrected entry: In this episode, Ross reclaims their washing machine after the Horrible Woman cons Rachel out of it, and Rachel tells him it's brilliant because she "can't even send back soup". But in The One With The Flashback - set before this - Rachel sends back a whole round of drinks.He's My Brother
Corrected entry: In this episode, when Monica and Joey are at the restaurant and Monica is talking to the other girl in the bathroom, the latter says that Bob is "really great in bed," to which Monica states that Ross didn't even tell her when he lost his virginity. However, in the previous episode when Ross remembers that it's the anniversary of he and Carol...consummating their physical relationship, he says he told EVERYBODY (including Monica).