Continuity mistake: While Will is in the meth lab he has two different handguns from shot to shot.
Continuity mistake: Will is at the police station reviewing the gas station camera footage. The first time they look at it there are two cars around the corner. The car she was taken in is the first one and behind it is a blue SUV. Then the camera view is blocked by a truck. The truck pulls away and the kidnapper's car is gone. About 10 seconds later they rewind the footage to get another look at the kidnapper but the vehicle that is behind the kidnapper's car is now a white truck. (00:27:52 - 00:28:17)
Continuity mistake: When Will enters Knuckles' trailer, the blinds (behind the lamp) are pulled up half-way on the left side but dangling to the lower right-hand corner. After Knuckles tells Will to "calm down" and the camera returns to Will, the blinds appear to be down on both sides. Also, the gaps between the horizontal slats change from two gaps on the right side to two larger gaps across the width. After Will and Knuckles start fighting, the blinds are pulled diagonally like they initially were. (00:41:57 - 00:42:18)
Continuity mistake: After Will threw Knuckles out the front door and followed, the screened door started to close about halfway. When the fighting outdoors was almost over, the screened door was fully open (perpendicular to its frame). (00:43:46 - 00:44:11)
Continuity mistake: When Will enters Knuckles' trailer, there's a large vertical hole/gap in the lamp's shade. Near the end of their fight, the hole should be visible but is not. (00:41:57 - 00:43:41)
Continuity mistake: Will was not wearing sunglasses when he walked up to Knuckles' fence to look between the boards. When the camera shifted to the opposite side of the fence, the person looking through the boards (presumably, Will) was wearing sunglasses. When the camera shifted back to the side of the fence Will was on, Will was not wearing sunglasses. (00:40:15)