First off, when it comes to the Star wars films, ANH and ESB are the ones that don't have anything that absolutely needs to be done to make it a truly better movie (even ROTJ could stand some changes that would make it a truly better film). It's all about the quality of the experience in these movies, since the entire film itself is fine to begin with.
Granted, there probably are quite a few suggestions made in the past that wouldn't really improve the experience (such as the green AT-AT lasers), but having Vader yell out like he's in pain when he falls off a platform and not when he gets a face full of steam (especially when he does yell out in pain later after being inflicted a painful wound) is inconsistent.