Many years ago a friend and I were going to shoot additional footage and add it to the movie as a joke. We were having a Halloween party and we were going to have it playing to see if anyone noticed. The changes were going to be simple and quick. For example the shot of the radio in the car at the beginning we were going to replace with a CD player. When he reaches for the cross/flowers from the back seat of the car to take to the grave we were going to add a quick scene of his hand rummaging by a bottle of Jack Daniels and condom wrappers before finding them. Stuff like that.
Never happened unfortunately.