George on altering the films
Small paragraph noting minor quality of life changes like color balancing etc. (Though, that's probably already handled in the release history section)
http://www.today.com/popculture/lucas-talks-star-wars-trilogy-returns-wbna6011380
https://www.polygon.com/2015/4/18/8448685/stephen-colbert-george-lucas-tribeca-talk
https://www.theguardian.com/film/2015/dec/01/george-lucas-han-solo-star-wars-1997-special-edition
http://comicbook.com/2015/11/30/george-lucas-explains-why-greedo-shoots-han-solo-first-in-star-w/
http://www.cinemablend.com/new/Ends-Star-Wars-Han-Shot-First-Debate-Once-All-115797.html
The original script of the Star Wars film included a scene between Jabba the Hutt and Han Solo, and the scene was filmed between Harrison
Some felt the change was a visual representation that Anakin through his redemptive act returned to the point when he belonged to the light side of the Force, before he turned to the dark side. It was also felt that Anakin died when he took the name Darth Vader, so it is expected he appear younger as a Force ghost. Others felt that the change undermined the redemptive nature of the act itself and ignores that he returns to the light side as an older man when he kills the Emperor.
Yoda in The Phantom Menace
Praxis effect
CG replacing the matte paintings
CG dewbacks
http://www.telegraph.co.uk/film/star-wars-the-force-awakens/george-lucas-movies-hate-defence/
http://www.mtv.com/news/2680917/why-is-it-such-an-issue-if-han-shot-first/
http://screencrush.com/star-wars-special-edition-20th-anniversary/