"Commando" with Arnold Schwarzenegger has so many goofy errors it is comical. In one scene there is a car chase with Arnold chasing the bad guy who is driving a yellow Porsche. The Porsche rolls over on its side clearly managing the entire driver side body. Arnold eventually pushes the Porsche back onto its wheels and you can see the damage on the car. But then as he drive the car away, a shot from behind shows the driver side of the car without damage again.
Near the end of the movie Arnold blows up the barracks where all the bad guys are staying, and all around the building you can see the cardboard cutouts of soldiers getting blown to the ground by the explosion. It is a clown show.