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.
Audio problem: When in the RV as the couples arrive at the RV park, Alice says, "Oh, this looks nice, don't you think, honey?", to which Frank replies, "Yep, pool and everything, the works." Frank is speaking with Roger's voice.
Continuity mistake: When the couples arrive at the RV park, we see a wide view of the park and Alice and Kelly are in their bathing suits walking towards the swimming pool. But a couple of shots later, the RV is parking with the couples getting out before Alice and Kelly decide to go for a swim.
Continuity mistake: When Roger rams the RV into the red truck during the chase sequence towards the end of the film, the impact destroys the radiator in the process. When we see a close-up of the RV being hit by the truck with the green unit a little later on, the radiator is now completely intact.
Continuity mistake: When Frank opens the door of the microwave oven when he is showing Roger around the RV, the position of Frank's hand on the door handle changes 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: When Roger is attacking the rattlesnake with a ski-pole in the RV, you can see the snake slides off the table-top surface as he does so. A few shots later, the snake is back in its original position.
Continuity mistake: When the RV is at the garage having its back window repaired, Roger is wearing a red shirt and Frank's shirt is green. When they arrive at the RV park, Roger's shirt is blue and Frank's is cream-coloured.
