Continuity mistake: When Nick and Bobby are playing craps in Rusty Nail's barn, Nick rolls "chest," resulting in Rusty branding Bobby with his R key chain. Rusty puts the red hot key chain in Bobby's shirt pocket and holds it against his chest. When Rusty lets go, you can see a hole has been burned into Bobby's shirt. The very next shot, Bobby is rolling the dice and his shirt is intact. Later on at the very end of the film, Bobby's shirt has the hole in the pocket again.
Continuity mistake: At the end of the movie, right before the truck goes over the cliff, Melissa drives the cab what seems to be a couple of miles before they get to the cliff. In the meantime, Bobby, left back in the truck part, manages to get out, busted kneecap and all, and hops those 2 or so miles, showing up what seems to be a short time later to be with Melissa as she peers over the edge. I've broken my foot before, and believe me, there's no way anybody cold hop any long distance with a busted kneecap, certainly not in any reasonable length of time, it's simply impossible.
Revealing mistake: At the end of the movie Melissa jumps from the burning truck leaving Rusty inside. As the truck bounces down the slope it catches on fire and explodes. You can see the engine compartment of the truck is empty, no radiator or engine, just an empty volume illuminated by the flames.