Revealing mistake: There are times in the movie when you can tell Bobo's beard is fake such as when Penny's giving him a drink from a 7-11 and it's peeling off near his right ear.
Audio problem: A punch thrown by Big Eddie during her fight makes a sound before it's even connected.
Revealing mistake: Terri is replaced by a stuntman in a dark blond wig once she puts on her motorcycle helmet outside the hardware store.
Continuity mistake: During the scene when Bobby's auditioning for a part, there's a picture on the wall of Helen Martin (the lady playing Bobby's Grandma). The picture disappears and reappears during the scene.
Revealing mistake: A bunch of seedy individuals are gathered, weapons in hand. Unbeknownst to them, though, deadly ninjas are creeping by, with all the speed of fast-forwarded footage. The problem, besides how obvious the trick is, is that it also features a visible jump cut; you can see the foliage change position literally from one frame to the other during the same shot. (00:01:30)