Also a slightly weird moment for me as a book fan was when the thopter Duncan escaped in clearly showed that it had shields with a rock crashing off of it, but then he was being chased by lasguns immediately after.

Glad to know I wasn't the only one who thought that was a bit off-putting. Same where the Sardaukar try to use a laser to get to Paul, nobility is almost guaranteed to wear a personal shield, so that felt like a very bad idea. Although you could argue that Sardaukar are fanatic enough to not care about getting wiped from existence in a nuclear explosion.