When Ann, alone in the desert, runs back to her Ford Bronco, the passenger side door is open. She never opened it.
The soldier who looks in Ann's truck for the snake has his uniform rank on upside down.
In some shots of Tom and the helicopter pilot flying through the desert you can tell that they are actually on the ground and that the helicopter's blades are not turning by the reflection in their sunglasses.
Up in the helicopter, the clouds do not move.
When the captain was shot, blood appears on his shirt before the gunshot is heard.
Sometimes it is dark in the mine shaft and sometimes it is light.
The 2 guys on patrol at night are bitten by the snakes. It appears light outside.