When Arthur crashes his car towards the end, after it goes up the trash cans, one can see the mannequin fall out of the open door (the door opening was probably accidental as it accelerated up the ramp), and then the mannequin is drawn back inside the car. Then the view cuts to the actors and the wife is lying on her side outside the open door.
When Grossman first calls in the accident, it's at the corner of Jefferson and Normandie, yet when Ponch and Jon go later to the suspect's home to confront him about leaving the scene of an accident, Ponch says the accident was at Pershing and Main.
It is stated that the silver T-Bird is a 1978 when in fact, it is a 1979.
When a drunk Mr. Holmes attempts to pass the two cars with cheerleaders the driver of the red car is clearly a man with a blond wig.
The brown Buick that the Thunderbird hits has damage to the left rear fender before the Thunderbird hits it.
In the long shot of Arthur and Denise being pursued by Ponch and Jon, you can see that stunt persons in the car and the female is wearing her seatbelt and sunglasses. When the camera zooms in on the actors, she does not have a seatbelt on and is not wearing sunglasses.
In the opening scene just before the opening credits, the drunk driver causes several wrecks. Two cars leap over one other one. A ramp is visible on both sides of the car and is seen a second time when a side view is shown.