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.
Factual error: Franchised chain restaurants always use the same beverage products in each of their stores. But in the beginning, the Topper Jacks that Tammy works at has Coke Products, yet the one she later robs has Pepsi.