Other mistake: When Howard, as TurboMan, is stuck spinning around in the sign at the end, the parade crowd disappears.
Other mistake: When Howard is running behind the car driven by the lady in the fur coat, he's always shown directly behind the center of the car, but when the lady looks in her side mirror (from her point of view), Howard is in the center of the mirror. In reality, she would only see a part of Howard's left side in the reflection (not his whole body).
Answer: The cop never states why he pulled Howard over, what he was charging him with or how many tickets he was issued. Howard just says, "I got a speeding ticket.' and holds up a folded piece of paper, so it's likely the ticket was for driving on the shoulder.