The car Mannix was driving when he went over the embankment was a 1967 Plymouth Belvedere 4 door but the sheriff's photo of the wrecked car is a 1957 Ford Fairlane 2 door,
When Mannix went over the embankment with his rental car there was no chrome trim on the side. Before the accident there was a lot of chrome trim on the side of the car.
Mike Connors misspeaks when talking with Jerry Douglas and accidentally refers to Larry Pennell's character as "Ed" when, in fact, that was the name of Douglas' character.