First off this thread is about the ending of the film "Duel" so if you want to watch it or haven't finished it, do not read this, I will not be using spoiler tags because this thread is about the ending of the film. In the end of the film the truck falls of the cliff and gets crushed now, I think that in the original blueprints of the film the truck was intended to blow up. The truck has the word "flammable" written all over it, now you may be thinking, "But all truck's say that" there are shots in the film were it just shows you "flammable". In the last scene where David Mann leaps out of the car, his car is dripping something, I think it is oil. Even when the truck smashes into the car there are flames everywhere. Though, Stephen Spielberg said the movie was filmed on location so the last two points may be invalid, but I still wonder. So did you think the same thing, how did you think it was going to end?