Two changes I did like were Paul’s visions of possible future where Jamis becomes his mentor in the Fremen ways and friend, it greatly improved the scene where he sheds tears for a man he barely knew.
I also really love getting to see more of Beast Rabban and the effect he has on Arrakis. Imo that’s something that’s actually skipped over a little in the novel. Rabban is just someone who we mostly only hear about, his death is passed on as simple information as well.