Corrected entry: When Smith and Shaffer get in the car accident in the German car, they push it over the cliff. They start pushing it without changing the gears. The car would have been in gear before hitting the pile of rubble and would need to be put in neutral to be pushed.
Jacob La Cour
11th Jun 2013
Correction: The impact could easily have have knocked the transmission into neutral. I've had this happen myself when driving a manual transmission and hitting a particularly large pothole.