In one scene, Arnold’s character drives a Porsche and gets bashed in while chasing the bad guy.
In the next scene the camera swings around, only to show a perfect, undamaged side of the same car.
This often happens in films due to the director shooting multiple takes.
Because one vehicle is damaged during the first take, for example, it has to be replaced with a new vehicle for the second.
However, the vehicle from the second take was evidently damaged in a different way from the first, creating the continuity error.