Dune

Denis Villeneuve confirmed in a Vanity Fair article that his adaptation of Dune will be split into two films in order to ensure that the original story would be "preserved and not cut into a million pieces." However, contrary to the common practice of filming several installments back to back, only the first movie (which roughly covers the first half of the source novel) was greenlit and produced, with an optional sequel depending on how well the first film performed. A sequel was greenlit on the Tuesday after the film opened. According to production designer Patrice Vermette, the movie was originally supposed to end later in the story, but during pre-production, these final scenes were shifted to the sequel, meaning that some of the preparation for Dune: Part Two (2023) has already been done.

When the Shadout Mapes presents Jessica with a crysknife, she sheathes the crysknife unblooded. By Fremen tradition, if a crysknife is drawn, it must draw blood before it is resheathed. (The Fremen with Stilgar later in the movie each cut the back of their own wrists in deference to this custom.) While it was indeed a mistake for Mapes to sheath the knife unblooded, this was not an "error" of the film. This happens also in the book. Jessica calls out Mapes for doing so, and Mapes offers her life as consequence for the mistake. Jessica, of course, lets her off with a mere scratch by the edge of the blade.

At the start of the film, a Sardaukar priest chants "Dreams are messages from the deep" as a prologue as it is subtitled onscreen.

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