Other mistake: In the scene where Dennis Quaid has just rescued Sharon Stone from the devil's throat, they are running through the woods to get back to the house. Quaid says to Stone that they will take the Jeep. He is referring to the Jeep Grand Cherokee that he drives throughout the film. It's a newer model, possibly a Limited, with flashy star-shaped chrome rims. When they get to the house, they see that the Jeep is up in flames. The camera hangs on the vehicle for a solid 3-5 seconds. From this camera shot, it is extremely obvious that the flaming Jeep has rims that, although still star-shaped, are styled quite differently and are most likely the alloy wheel that was very popular on the older Laredo edition from the early to mid-90's.
Continuity mistake: When Dale falls through the roof to his death, he lands with his head facing towards the right, but when they zoom in on his body, he is facing straight up.
Continuity mistake: When Cooper and Leah Tilson first find Devil's Throat, the time of day changes between shots. When they leave their car, it is already getting dark. In the next shot, while uncovering the hole, the sun is shining. It is dark again in the next shot.
Revealing mistake: In the scene where they are at the rooftop escaping from the snakes and at the part where the mom screams, you can see her smile a bit.