After Gomer wrecks Sergeant Carter's car, the police description of the car is a 1959 Dodge. The car is actually a 1956 Dodge.
Carter's car is a 1959 model. But in Gomer Minds His Sergeant's Car (1965), after Carter's beloved, 1960 red and white car was demolished (by a wrecking ball), he was given a brand new 1966 sedan.