Other mistake: In one of the first scenes in the study, Mr. Boddy hands each guest a weapon and then proceeds to turn out the lights. The room is thrown into complete darkness. Unfortunately, there is a roaring fire in the fireplace that would have illuminated the room enough for everyone to see what was going on.
Other mistake: Fraker's footprints are right next to each other in Kersey's bedroom. The right footprints even with the left footprints. The only way for this to be possible is if he had hopped around the room rather than walking.
Other mistake: At the carnival, the duo is told by the carny that they get seven rings for a dollar, but the only get five.
Suggested correction: The carny never says anything about how many rings a player gets. He only tells them the way to win, by getting a ring on a bottle.
When he's leaning up against the poke he says "Here we are folks. Seven hoops for a dollar."
I stand corrected. I just rewatched the scene. He does in fact say seven for a dollar. Interestingly, it's clear he hands Chun five rings, but when the rings are shown on the bottle, SIX are shown.
Other mistake: A long-nailed woman types the opening credits in a computer, but in a couple of instances (the Playboy Playmates, for example) you can see her type away when the credits page is already complete and the names are already there. (00:01:00)
Other mistake: After the Griswolds leave the German couple's house, the man says "Who the hell were they?", and the woman says "Beats the shit out of me." However, since they slept there overnight, they had enough time to discuss it in private much earlier.