Trivia: At the end of the film when the truck goes off the cliff, we hear an odd groaning sound. This is a dinosaur growl from an old movie Spielberg likes. Interestingly, this same sound is also used at the end of Jaws as the shark sinks to the bottom of the ocean. Spielberg did this to show that Jaws and Duel would always be closely connected.
Trivia: The scene where the truck goes over the cliff had to be perfect the first time - the production team could not afford to purchase other trucks due to the extremely low budget.