Jenny's car can be seen with four different inside mirrors throughout the film and doesn't have one at all just after she is pulled over.
Damage to Jenny's car door disappears and reappears several times. Also, worse damage from sideswiping a semi truck is seen briefly some time before the accident.
Most of the time Jenny's car has a remote outside mirror. It disappears and reappears a couple of times then changes to a manual mirror a few minutes before the car loses it for good.
Ed tries to stop Jenny's car by pulling the parking brake lever which burns out the brakes. In reality this would have only burned out the rear brakes.
When the policeman is repeatedly listening to a fragment of the recorded conversation with Jenny, it is evident (from observing the reel) that the tape is rewound more than it is played back, even though the very same fragment is heard on each playback.
One of the doubles for Jenny's modified Ford Maverick can be seen parked while Dexter is skateboarding.
The shift lever in Jenny's car can be seen in park twice while the car is in motion, once when Ed reaches for the parking brake lever and Dexter grabs his arm, and again when Ed tries to turn off the engine.
When the hood on Jenny's car blows open it briefly blocks the windshield. However, just as it opens one can see that it was not bolted to the hinges. The same shot is re-used when the hood finally comes off.