In the movie "Attack of the Fifty Foot Woman" our hero is driving a 1957 Plymouth two door station wagon. She picks it up and, when in her hands, it is a 1954 Chevrolet four door station wagon. When she throws it to the ground, it becomes a smashed 1957 Plymouth two door station wagon again.
In the movie "Killers Three" starring Dick Clark, the villain's car keeps switching back and forth between a 1939 Chevrolet and a 1940 Chevrolet. It also switches back and forth between a two door sedan and a four door sedan.
But who notices these things?