One major goof on Adam-12 happened in the episode at the Police Academy driving school. Malloy drives around the track in a '68-'69 Belvedere but the inside shots show a Matador dashboard and interior.

The Blues Brothers 'cop tires and 440 plant' speech looks like it was based on dialogue spoken by Malloy in episode one of Adam 12.

I agree that they had a little motor pool of vehicles that showed up in many episodes of Adam12, Dragnet, and Emergency! I'm into flathead six Plymouths and they had a green '49 Club Coupe that popped up in several episodes.... with the Plymouth name taped-over, of course.