Jodorowsky did read Dune according to the documentarian:
"The truth is that he had not read it when he had the idea to make the film. At that point, someone had told him it was good. Hilarious. But once he embarked on his mission, he of course read it as he did the screenplay adaptation before anything. His film would have been remarkably loyal to the novel, of course with some of his own genius in the mix."
