Continuity mistake: At the end, when Charlie is writing "As Wichita falls, so falls Wichita Falls" on the back of the RV, it shows him only making a couple strokes with his marker, only being able to write a few letters at most. In one of the very next shots, he is hit by the back of the RV as the driver, who is trying to start the engine, accidentally jerks the vehicle backward suddenly. Before he is hit, "As Wichita falls, so falls Wichita Falls" is written out completely. There is no way he would have had time to write all of it.
Continuity mistake: When Charlie meets Vic in the restaurant, in one shot Charlie is holding his drink up to his chin about to drink it but in the next shot he has it near his lap. This happens again with Charlie when he is sitting at the bar with Pete; his drink is up near his chin then down when Pete yells something stupid.