Revealing mistake: When the protagonist jumps two of the evil cowboys that are after his jewels, the stuntman on the right tosses aside the rifle in a quick deliberate move pretending to lose it. (00:10:25)
Revealing mistake: Establishing shots of the party where Chaney will fight Pettibon's guy; when we see the band play and people dance, the footage is rather obviously stopped and reversed to give the impression of a longer shot (evidently they had too little usable film of the crowd dancing). (00:31:00)
Revealing mistake: When the motorbike randomly explodes after Terri and Dave get out of the car, it is obvious that the explosion does not come from the bike, but from the shrub behind it, which also happened to creep up closer between shots. (00:07:30)
Revealing mistake: When Tim crashes the van into Jill's mini when she is reversing into a parking space, the rear light on Jill's mini is already broken before the van hit her car.
Revealing mistake: Walter and Joanne have two little girls at the beginning of the film, but then much later, there are suddenly two young boys seated at the table during breakfast. (01:17:00)