During the chase scene, when the Wyoming Sheriffs are pursuing Starkweather, he appears to be driving on the right-hand side of the car, but the image is flipped (which is proved by the license plate, also).
The episode is set in 1957. The Air Force airman at the crime scene at the beginning wears chevrons with no silver stars in the blue center circle, a rank insignia used only from 1976 to 1991.