Corrected entry: Throughout the film we see the caravan door being opened outwards (and at times being closed with force, which shows it does not swing inwards). However, in the scene at the end of the film when the caravan is blown up, we see a shot in which some matches have been attached to the bottom of the door and the striking piece of the match box stuck to the caravan floor, which means that when the door was opened the caravan would not actually have blown up.
Corrected entry: When the family leaves the gas station to take the dirt road shortcut, the sun is casting long shadows as if it were approaching sunset. A few moments later, after the tires get blown out, the shadows are very short as if the sun were almost directly overhead. The inconsistency of the sunlight's shadows continues throughout the entire first part of the movie until the first nightfall scene.
Corrected entry: Even at close range, the shotgun blasts that Doug riddles Lizard with would have left much larger entrance wounds.
Corrected entry: When the man enters the crater filled with broken cars, he would have died of radiation poisoning due to the lasting effects of the nuclear explosion.
Corrected entry: When Billy tries to put his dead sister in the car, her body is limp and floppy. In reality, it would be stiff as a plank due to rigor mortis.