Revealing mistake: During the chase on the dirt road, Jeff pulls the Jeep up to the edge of a cliff. Look at the ground ahead of where he ends up. There are clear tire tracks, and the Jeep follows them to a T. This was obviously where they practiced the scene before.
Continuity mistake: The police officer shows up to hear about the woman missing. When he stops the sun is behind him. The scene cuts and the sun is overhead. It changes several times after that.
Audio problem: When Amy first gets into the semi, we can hear her talking to Red but her mouth isn't matching what she is saying.
Continuity mistake: When Jeff and Amy run out of the barn and to the truck, there is an angle where it shows the sun already above the horizon, but then the same angle is shown seconds later with Billy chasing them and now the sun hasn't quite risen yet. This is out of sequence.
Character mistake: When Barr denies giving Jeff's wife a ride, Jeff says this was in the last half hour or so - but considering the time it would take the truck to go to Belle's (5 miles away), the wife to call a tow truck, back from Belle's, then Jeff waiting extra time, then fixing the jeep, heading to Belle's, the time he spent inside, then driving along the road until he saw the truck would in no way be only a half hour...more like an hour or two at best.
Suggested correction: Jeff is obviously in distress because he can't find his wife. Is it not possible that because of the stress he's under, the amount of time that has passed is different for him? Besides, we know the wife never made it to Belle's. Later, we see she's been transferred to another vehicle.
Continuity mistake: When Jeff goes to the washroom in the bank, there is a mop/broom handle leaning against the corner of the wall by the door. After he rummages through the cupboard looking for a weapon, the handle is gone.