I first read Dune in 1984 around the time of the first film. I love the series (well the first four) and I have re-read it many times. It has some logical problems here and there however.
1) What exactly is a Kwisatz Haderach, and what would the Bene Gesserit do with one if they had one?
It seems at first this superman will be able to access male ancestral memories, which BG members can't do. But this doesn't seem to be an important ability for Paul, ever. His sister manages it (with terrible results) and no one seems to think it is a sign she is a messiah.
Is the important ability prescience? By book two, tons of folks are dabbling in prescience, and Guild Navigators seem to be pretty good at it. Is the KH just the best at ?
2) Why do the noble houses let the Bene Gesserit control their bloodlines? It's a terrible deal, even for the emperor. If they trained men, it would be another story, but supposedly Paul, Count Fenring, and a few other males are oddities.
3) Why is anyone wearing Defensive Shields when a laser pointer would make them go off like a nuke?
I've never understood why Herbert made shields work this way. It would make more sense to simply have them block lasers like they do everything else.
4) Why does the Spacing Guild let the nobility control Dune?
They have a monopoly on interstellar travel. They could make sure no one else ever gets there, and they could mine the spice themselves.
One question that every adaptation has to answer to some degree: how far does the technology ban go, and what kind of technology can your average planet make?
I assumed that the Imperium is maybe at the level of the Industrial Revolution before electricity when I first read the books, with the exceptions of Ix, Richese, and the Bene Tleilax. Even a space heater is from Ix in the second book. No video technology seems to exist. I assumed this tech level for the 84 film, too.
ETA: film books may count as video technology, depends on how you interpret it
The sequel series by Herbert's son and Anderson (which is an ABOMINATION 😉 ) seems to assume the tech is like Star Wars minus the Droids and navigation computers. The SyFy adaptation seemed to assume this level of tech as well.
Any other fans have hopes for changes or clarifications in the upcoming movie?