In The Fast and The Furious, when Vin Diesel's character flips his car on the lorry in chapter "Honour" on the DVD, or in the last few scenes for all you VHSers, the bracers to keep the car in one piece in a stunt can be EASILY seen through the window. It is when its side wheels are on the floor and it has hit the ground. (1:33:44 for precise DVD time)

I know its a teensy bit trivial, but they could have used digital enhancements on the scene, a different camera location, etc etc etc before they went gold.