Amidst the other stuff mentioned, there's his constant tweaking with the original films. He seems to have a real problem with a decades old film looking like a decades old film and was desperate to try and keep them looking like they were made yesterday.
Which is a mugs game for two reasons. First, special effects will always date so if you want to keep up with making the films still look modern you have to spend the rest of your life updating them every few years.
Secondly, the updates were done with no sympathy for the original material. Star Wars on blu ray doesn't look like a 2012 film, it looks like a 1977 film with some CGI slapped on top of some scenes.
I've never understood why he bothers anyway, kids still like The Wizard of Oz without any snazzy updates don't they?