Revealing mistake: As Bobby and Brenda are loading the bodies into the van, Lynn can be seen breathing.
Other mistake: When Lizard enters the trailer he closes the trailer door. When Lynn runs towards the trailer and enters it the door was already open.
Revealing mistake: When the dad goes back to the gas station and finds the attendant in the outhouse, when he shoots himself his head blows a split second before the gun is actually fired.
Continuity mistake: When Brenda saturates the tire with lighter fluid, right before she lights it, it turns to burn gel.
Continuity mistake: At the very end of the movie, when Doug returns with the dog and the baby, the survivors have a big hug. Then the camera pans out and we discover someone is watching them. When the camera pans out there is absolutely no sign of the trailer that just blew up or the car.
Continuity mistake: Soon after the car crash in the desert, the mom is seen bringing out deck chairs. She brings out two (one dark blue one and one light blue one) and leans them up against the campervan. But in the next shot the light blue one which was in front of the dark blue one has vanished. (00:22:25)