+1
While this one might not be obvious to most people, in an incredible number of films and TV productions it is pretty clear that the vehicle flying off a cliff and/or rolling down a hill is not the one that was filmed on the road just before the crash scene.
For the movie about Preston Tucker and his cars, Coppola had 4 Tucker replicas made in order to film the scene where one car rolls during testing. It probably cost a lot of money to make those replicas, but whatever they spent was still cheaper than the cost of destroying one of the remaining 40+ Tucker automobiles.