When Thomas offers Victor money to help get him to Phoenix, his braids change position. In one shot, they are both in front. In the next shot, his right braid is over his shoulder. This repeats several times.
When 12-year-old Victor beats Thomas up right after his dad leaves, he is wearing a white and red shirt under his button-up shirt. After he begins running, the undershirt changes to a completely red muscle-tee.
When Victor drops Thomas off at his home, you can see the shadow of the rear-view mirror, cast on the truck seat. In the next scene, when Victor stops at his home, the mirror is gone but the bracket is there.