Continuity mistake: On the truck cab's rear window, there is some sort of air conditioning unit installed. In some shots, such as the gas station scene where David Mann is on the telephone, or the railroad crossing scene, the air conditioning unit has a support structure to hold it in place. In the rest of the film however, there is not any support structure to be seen.
Visible crew/equipment: When David's car gets stuck on the bus bumper, the next shot is of the bus' black bumper and the side of the car. At the top of the black bumper there are two people seen in the reflection. The person on the left turns and takes a step to the right.
Revealing mistake: Just before the truck slides off the cliff edge, you can see that the truck's cab door is open where the driver jumped out.
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: This film garnered so much critical praise that it was theatrically released in quite a few countries, though it was originally a made-for-TV-movie for NBC in 1972.
David Mann: I'd like to report a truck driver who's been endangering my life.
David Mann: Come on you miserable fat-head, get that fat-ass truck outta my way.
Question: Why didn't David simply turn around and go back home? The truck never turned around to get him, it just waited further ahead up the road. David even stated he'd never make his meeting now due to delays. Huge plot hole.
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