After Petty talks to Ruth, he returns to his car and the driver's side window is open in one shot, half-closed in the next and open again in the next.
When Helen pulls over to have a smoke and chat with Marty, there is an blurred outline of two trees trunks behind her through the partially opened window. In another shot, these tree outlines are gone.
When Charlotte and Jonah are speaking in his room about finding the money, there is shot from behind his head and when Jonah says "...next time give me your money..", his lips are not moving.
At the Snell's farm, longleaf pine trees are everywhere. However, there are no longleaf pine trees that grow within 500 miles of Missouri (filmed north of Atlanta, Georgia).