Corrected entry: When Matthew Perry is hanging out with Neve Campbell and her friends, he's standing up talking about how men aren't a piece of meat etc, and he has an empty margarita glass and a pitcher. At the end of his speech his glass is full and he takes a drink from it.
Corrected entry: Matthew Perry (Oscar) is shown sitting on a lawn when the sprinklers come on, yet in the next shot, he is riding his bike, dry.
Correction: It's a bit hard to tell whether or not he's actually close enough to be hit by them or not.
Correction: Oscar grabs the margarita glass from Amy when he gets up. He proceeds to grab the blender full of margaritas. You don't see him pour it out in the glass, but you could imagine that he did during the shot where it cut to the laughing women.