When Earl & Ray are together in Earl's car near the end Ray says that he hasn't been back to Earl's hometown for 60 years which would be the birth year for Earl however in an earlier scene Ray had confessed to having scarred Earl by
throwing a rock which had hit him as Earl & his father were exiting a store.
When Earl and Ray are saying goodbye for the first time in front of Ray's house. Earl is standing behind the car and the car moves before the engine starts. The next frame shows the car still in place then moving forward.