Continuity mistake: In the scene where Tim goes to Julie's gallery to tell her his good news. When Julie comes out to meet him she is wearing earrings and then the next shot she is NOT wearing them, then in another shot she is again.
Continuity mistake: Near the end, when Barry takes the "Tim" mouse out of the trash to work on it, he takes off his regular glasses and puts on his magnifying visor. When he flips the visor up, his regular glasses are still on underneath.
Trivia: This is a remake of a very famous French comedy, now a classic, Le dîner de cons (available in English as The Dinner Game), itself based on a play which was subsequently altered to conform to the minor changes made when the original movie was filmed.