Revealing mistake: During the funeral for Harvey, in the middle of the film, sometimes you can see Harvey breathing even though he is supposed to be dead.
Continuity mistake: During the sketch with the rental video, Ray's can of beer moves from one side of the table to the other in some shots. Also, his popcorn level in the bowl keeps changing.
Continuity mistake: During the "Silly Pate" scene during the movie, the piece of Pate that is slapped down on the paper is different to the one that is pulled up by the man to reveal the "Popeye" cartoon imprinted in it. It becomes rounder and bigger.
Continuity mistake: In the "Mondo Condo" sketch, between the time when the video spits out of the machine and the TV blows up, the videotape moves around in every shot.