Other mistake: When Ace rescues the dog and replaces it with a toy dog, the toy dog is in an impossible position. Ace had to place it there when the door was still open, but if the door was closed after that the man would have knocked it over. (00:03:25)
Other mistake: When Ace and Dan Marino pass in their car, on their way to the Superbowl, the stadium in the background is the one holding the special event, yet there's no car in the parking lot.
Other mistake: If Lois Einhorn is Ray Finkle, then how come Finkle has bigger fingers at the beginning, when Snowflake is being abducted, than he does in the end?
Other mistake: The band Cannibal Corpse is falsely credited as "Cannibal Corpses" in the end credits.
Other mistake: When Emilio is rummaging through Einhorn's desk drawers, he finds a note from Roger to Einhorn, thanking her for a wonderful evening, and saying that he'll see her on Friday. When Emilio calls Ace, he says that the note says that Roger was thanking her for a wonderful Saturday evening. He never wrote down what day the evening was on. It never said Saturday anywhere on the note.
Other mistake: When Ace goes into the death metal club two people stop moshing and very obviously look at the camera smiling straight at it.
Chosen answer: That scene was cut originally by the director Tom Shadyack because the scene did not support the story and thought it slowed the film down. (And the scene was cut from the US version as well.) It was added back later in TV versions of the film. Fan enjoyed the scene so much they asked it be put back in the film version. I know the DVD has it because I own it. It's hilarious!