Continuity mistake: When Rachel goes to the "group", her bag is multi-coloured; when she comes home from the "group", her bag is different, it is now just black.
Continuity mistake: When Peach collapses on top of Mario after the weird TV invasion, Mario's arm is on top of hers, but in the closer shot that follows his arm is distant and in fact it is behind hers the moment he turns a little.
Continuity mistake: The amount of roaches in the bowl at the bar changes from less to more.
Plot hole: Chelsea says that when her deceased father gave her one of his paintings (now missing), he wrote an inscription to her on the back. She says she cannot prove that he actually did this other than he noted it in his journal and she does not know where the journal is. However, when Chelsea's father presented the painting to her on her 8th birthday, there were at least 100 adults present at her party who witnessed him giving her the painting, writing the inscription, and signing his name on the back of the canvas which was displayed to the guests. Any number of these people could be contacted and corroborate her claim.
Continuity mistake: The views of von Ragnar at the wheel of the semi truck show him wearing tight-fitting glitter gloves as seen into the cab, but large, looser, darker gloves in closeup shots of von Ragnar's hands on the wheel.
Visible crew/equipment: As Abe Vigoda pronounces the last line of the movie ("Take care, my friend"), a boom mike pokes up in full view from the bottom right of the screen.
Factual error: The brothers had a two-way mirror installed in the fitting room. Todd makes faces at his brother through the glass. If the mirror had really been two-way, the woman would have seen the reflection of Todd making the faces and would have known something was up. (00:19:28)
Continuity mistake: David Chiang chases the man in a purple dress at the 1985 Hong Kong Marathon. He fires a warning gunshot; if you look at the guy in the back of the pick-up that the criminal is about to hijack, he lets go off the bar twice in two different shots. (00:02:35)
Visible crew/equipment: In the opening sequence, Sammo Kam-Bo Hung is scavenging the dead soldiers (with one hilarious twist) - however, when he is holding the ring, in his sunglasses you can see several very much alive crewmembers standing. (00:02:45)
Revealing mistake: When Louise pulls off Joel's trousers, we see that he is wearing briefs under his boxers.
Revealing mistake: During the credits, Don Falcone is reading about the bloody feud between fellow cheesemaking mafia families Lombardi and Zanetti. The first article he browses is the April 7, 1985 edition of the Italian newspaper "Il Messaggero," with a bad glue-on job (the left column's font does not match the rest of the actual newspaper). He then reads about the car bombs in another newspaper, "Paese Sera." Here the prop design is better, but if you can read Italian, you can easily see that the article does not match its headline at all; it's not about a brutal mafia murder, but rather about the "sliding wage scale" referendum which was taking place in the country at the time the movie was shot, in 1985. (00:03:00 - 00:04:15)