Hi, I am particularly interested in this edit.

As one who (of course not as the only one here I guess) has read nearly all of Dune including “The Dreamer …” and Frank Herberts biography, I have the impression, that especially Paul is not as he was intended to be. I would therefore suggest to change in particular following three scenes:

When Jessica encourages Paul to use the voice in the beginning … They think, just because he is not in the mood for swordfighting in the scene with Gurney, that Paul is a capricious character, but that he is not. So he should not refuse in this scene and he generally should not be characterised as an unenthusiastic and obstinate fool thoughout the movie.
When Paul and Leto talk about whether Paul wants to be Duke later … this is something, that may belong to THIS world (which is why the scene is in there), but not to Franks Herbert’s world … Paul is sure he will be Duke. See chapter six in the book.
When Paul shouts at his mother in the desert … he wouldn’t. In particular, he would have known that he is raised Bene Gesserit style, he would not have characterised himself as “being used” or similar, this is the reaction of an infant.

Also, I don’t think one can do anything about that, but unfortunately Chalamet permanently tries to look stern and serious for the gravity of the Dune-universe and all the philosophy in it (I guess), but you can see, that he only plays it in many of his scenes.