Goofs

Johnny, Michelle and Howard stop in Johnny's car and get out and confront Johnny's supposed girlfriend. Michelle goes back to the car first and gets in the back seat though she had made a big deal of sitting in front earlier. Howard gets in the front passenger seat. The car drives off and when it is shown again. Howard is in back and Michelle in front though there have supposedly been no stops.

When the cops awaken, the side of the cop car says "ICE" on it since the back door is missing and only the front door is there. Later, when the killer donuts escape from the house and get into the car, the car now says "LICE" on it, as now that part is just on the front door.

A few times after driving in the black Volkswagen Beetle, the two passengers switch places between the front and back seats. This may not be a goof because it's possible that they stopped and switched places along the way, and we just didn't get to see it. Of course, that's more likely for the first time than it is for the second time, as they would not be likely to stop to switch places while escaping from the house.