The story plot reveals The Driver and R.V family were killed in 1972. The R.V. is a Bounder by Fleetwood, first introduced in 1986. It has rectangular sealed beam headlights not popularized until the late 1970s.
When exiting the truck Marilyn puts the pistol in the back of her shorts. When she gets to the bathroom, she pulls down her shorts without dealing with the gun that is supposedly there. It should clatter to the floor.
When Jared has to stop to get oil for his car (red Ford), they do a close up shot of the odometer showing a 'Check Engine' light. It is actually a close up shot of a mid 90s Subaru odometer not Ford Tempo.
Tom Hitlz is referred to as Corporal throughout the movie. However, the insignia patch on the Class A uniform he wears at his welcome home party is Private First Class (PFC). He is neither a Specialist nor a Corporal. He was a PFC.
Tom's uniform has an 82nd Airborne patch on both shoulders. In the Army you would wear the patch you served with overseas and the other patch would be of the division or unit you are now assigned to when you came home.
Tom Hilts is constantly referred to as a corporal, which is an E-4 rank in the Army. However, he is part of the 82nd Airborne (Infantry) so the rank of E-4 is referred to as Specialist, as the correct Specialist insignia on his Class A Uniform shows.
When Jared is driving his car in the end, and he looks up to peek under the hood of his car's sun-blocker, you can clearly see his right eye under the bandage. Earlier it was 'taken out' by the 'driver'.