Just after Arnie has dropped Sully of the cliff, he needs a car to get back into the city, as his is has a lamp post in it now, he chooses Sully's yellow Porshe. In the scenes preceding this, the driver's door on the Porshe has had a few dents put in it in a car chase. Now, after Arnie has tipped this car back on its wheels and starts to drive off, look at the door as the car disappears into the distance. It hasn't a scratch on it!!!