Continuity mistake: On the DVD, you can watch the "Original Ending". In this version, Fuller ends up in a cop jacket and hat right before and during the corn field scene. In a shot from the actual ending, you can see Fuller wearing the jacket and hat...but it's only for about 5 seconds. I guess they forgot to edit it out when they changed the endings.
Continuity mistake: After Lewis picks up Fuller, they are driving along a highway. The shots of Lewis show that the top of his door is damaged so that a large black gap arches from the front of the door to the back. The outer skin is obviously deformed (compare the top of Fuller's door for what it looks like undamaged). After Lewis pulls over, shots of him show his door is now fine.
Continuity mistake: In the DVD with the other endings, when the boys are in the restaurant naked Venna beeps the horn and they run out. Later on after chasing the truck and the car flips, you hear Charlotte scream and Venna runs back into the car. Look carefully at the CB radio. When Venna picks it up it says 18 but then you see another view of it and it says 19.
Continuity mistake: There is a scene where the 2 brothers' car is pinned against a tree by the truck, and the driver's door window is shattered, spraying safety glass inside (I used to work at a bodyshop, and that gets everywhere). In the next scene, the window is shown shattered/cracked but is up fully in the window channel.
Continuity mistake: When Lewis and Fuller are being chased by Rusty Nail just after their encounter with the ice guy, you can see one of their hubcaps come off the front/left side of their car, but it has reappeared in the very next exterior shot and is there throughout the rest of the movie.
Continuity mistake: Just after Lewis and Fuller pick up the CB radio, you can see that Lewis is resting his arm on the back of the front seat, but in one of the following shots if you look closely he has his arm next to him, and in the next few shots its back on the seat then when Fuller punches him he puts his hand on the steering wheel.