Denis Villeneuve's adaptation of Dune is unquestionably fantastic, and shows deep respect to the source material. With the necessary changes to transform even half of that beast of a tome into a movie, it takes care to hit all the important points.
However, there is one change from the book that I found surprising:
In the books, after killing Jamis during the amtal, Paul cries. This shocks the Fremen, who see this as "giving water to the dead", the greatest of sacrifices in that arid land. This inspires such respect that he is welcomed into the tribe.
However, in the film this doesn't happen. Paul kills Jamis and is clearly really upset about it. All the Fremen put their hands on his shoulder as he walks away, but no precious water is spilled. Stilgar then says he's now one of them.
The scene still works well, but it seems an odd omission: it wouldn't have been expensive or complicated, nor required much airtime to convey, and (in my personal opinion, at least) the scene would've been stronger with it.
Has Veilleneuve explained why the scene was made this way? I only ask because I've seen many interviews of his explaining all the care that was taken with the Gom Jabbar, the ornithopters, etc, so wonder if he ever mentioned this change.