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.
When Tammy is getting ready to hit the road she asks Pearl why she should bring her along. Pearl states she has $6,700 and Tammy agrees to take her along. This is the exact same dollar amount Susan Sarandon (Pearl) asks her boyfriend to wire her in "Thelma and Louise".