Speaking of Lucas' revisions, when I was looking up some details for the review, I came across a series of essays on the Star Wars original trilogy (both the actual films and their drafts and deleted scenes). It might make some interesting reading considering all the changes (good or bad) that were applied to the original vision and how many discarded details ended up getting recycled, so I am sharing the links below. The writing could be a lot better, but bear in mind it was quickly translated from the original German (not by me).
Episode IV: Star Wars/A New Hope HERE
Episode V: The Empire Strikes Back HERE
Episode VI: Return of the Jedi HERE
Episode IV: Star Wars/A New Hope HERE
Episode V: The Empire Strikes Back HERE
Episode VI: Return of the Jedi HERE