Deliberate mistake: The Fremen wear "stillsuits" to conserve their water, yet leave their heads completely uncovered. This would result in quite a bit of water loss through perspiration. (In the book, they wore hoods, masks and nose filters, leaving only the eyes uncovered, but it wouldn't work in a movie to have all the actor's faces obscured!).
Dune (1984)
1 deliberate mistake - chronological order
Directed by: David Lynch
Starring: Max von Sydow, Patrick Stewart, Brad Dourif, Kyle MacLachlan, Jose Ferrer, Francesca Annis, Sting, Leonardo Cimino
Revealing mistake: During the invasion of Dune by the Harkonnen, a Sardukar soldier throws a guard from what appears to be the palace's wall. When he hits the ground all the bodies around him bounce as if they where lying on some sort of cushion. (01:09:50)
Duke Leto Atreides: I'll miss the sea, but a person needs new experiences. They jar something deep inside, allowing him to grow. Without change something sleeps inside us, and seldom awakens. The sleeper must awaken.
Trivia: The tendons on the worm when it gets hooked by Paul are made from condoms.
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Answer: Because it was edited in a way he didn't approve of. The film was actually over 3 hours long, and it was trimmed by about an hour for the cinema version, and then a certain amount of pick and mix went on to come up with the video version.
David Mercier