Continuity mistake: When Chris and Dani are at the police station and about to have sex, her shirt mysteriously reappears. They are kissing and Chris is shown removing her shirt (leaving her in a red bra). A few seconds later they are still kissing, and you can see that her shirt is back on.
Visible crew/equipment: When Knoxville and a bad guy end up fighting hand to hand downstairs (in Chris's house) after trading off shotgun blasts at one point they end up grappling in front of an armoire with a glass front. Just before they struggle off to fight in another part of the room you can see a crew member with a black shirt appear from the left in the reflection of the glass. Since Chris appears in the scene about a few seconds after this it could be him. He was also wearing a black shirt but one things for sure whoever it was was not meant to be seen as they quickly ducked out of sight.
Continuity mistake: When the Rock and Knoxville are taking apart the bad guys truck you see a shot where the Rock is pushing a tire away from the truck which has no tires and then slicing it open with a chain saw. A few seconds later you see Knoxville taunting the bad guy and the Rock is again rolling a tire away from the truck.
Continuity mistake: Wheb Hamilton shows up to talk to Chris after he's been attacked, we see Chris unload some wood from his truck, then belt on a tool belt. After belting it on, he pulls his shirt out from under the belt and we see his stomach. There are no scars on his stomach from the earlier attack on him. Later in the courtroom, Chris opens his shirt and we see scars from his collarbone to below his navel.
Continuity mistake: After Chris becomes Sheriff we see him pull Hamilton over in his car. As they are talking the camera cuts to the far side of the car where we can see the girl in the passenger seat. She is facing forward at the road, and then when the camera cuts again from behind Chris we see that she is now looking at Chris.