Continuity mistake: After Roger hits the back of the box truck in front of the RV during the car chase scene, Alice is knocked forward over the counter where an open pack of a stick of butter is sitting. Alice's torso flies forward over the counter, but the next shot she is standing, and the package and the butter are not flattened by her chest, nor is there a mess on her sweater that would be there after being crushed by her.
Continuity mistake: When the RV leaves the holiday park after the group find Ginger killed, look at the back of the vehicle and you will see that the window that the mechanic repaired earlier is just covered with brown paper. It changes to a patched-up window later on in the movie.
Continuity mistake: When Roger throws one of the motor bikes off the RV during the chase sequence towards the end of the film, we see a driver's view from the white truck and you can see a piece of debris going into the grass when the bike crashes onto the road. In the next shot, the same piece of debris is now next to the bike when the white truck drives into it.
Continuity mistake: When the RV is driving to Amarillo towards the end of the film, the vehicle is coming towards a detour sign and we see a group of road workers, one of which is a bearded man with a cowboy hat and no t-shirt. But when we see a view from the RV going towards the detour sign, the bearded man is seen walking towards his colleagues.
Continuity mistake: When the RV is pursued by a white truck and two cars towards the end of the film, the weather changes from hot and sunny to dull between shots.
Continuity mistake: Watch Roger's chair during the scene when he shoots the man who is breaking into the back of the RV. When he stands up, the chair is facing the windshield but when we see Roger walking towards the back of the RV with his shotgun, the chair has mysteriously turned around and the back of it is facing the side window.
Continuity mistake: When the group leaves the RV park after they find Ginger has been killed by the cultists, Frank asks Alice to make some coffee and she goes to a cupboard and opens the door. When the camera is inside the cupboard in the next shot, the door is closed and she opens the door a second time.
Continuity mistake: During the car chase sequence towards the end of the film, Roger asks Frank what the blue truck is doing to the back of the RV. Frank then goes to the back of the RV and the sliding door is open. When the blue truck rams the RV, we cut back to Roger in the driving seat but if you look in the back, the sliding door is closed and Frank is nowhere in sight. A couple of shots later, Frank is back near the window again.