Factual error: Tammy hits a buck with her car, which has polished antlers. The next day her and her grandmother are in the woods, and they see another buck, whose antlers aren't fully developed, still in velvet. These two scenes would have to be several months apart for antlers to be that different.
Continuity mistake: When Tammy and Pearl are in the riverside park singing Midnight Rider, a boat passes slowly behind them towards the left of the screen. In one quick shot, the view of the boat is blocked by Tammy, but then the boat never reappears in the scene and the wake has disappeared, with no time for the boat to have moved completely offscreen.