Other mistake: When Amy goes to the cabin at the end (where she gets killed) she is looking for Mort. She calls out for the dog (Chico). Wasn't she told earlier that Shooter killed Chico? (01:22:00)
Other mistake: When Johnny Depp finds the two bodies dead in the jeep, he turns around and spots a squirrel in the tree. We get a point of view shot looking at the squirrel, before Depp faints and the camera starts falling to the left. In the next shot, however, we are facing Johnny Depp and see he has fallen on his right side.