At about 17 minutes in, when they're showing the shell casings from the drive-by shooting, they're clearly necked cases, and the M1 carbine used in the attack shoots a straight-walled case.
At the beginning when the two escapees are in the bar, a song is being played, You Can't Roller Skate in a Buffalo Herd. This song was released 15 years after the scene was supposed to take place.
The rear tire on the yellow motorcycle in the shop is not period-correct. The tread design is at least from the late 90s or later.