RU.08 said:

While he was complicit in 1997, a month before his death he told a different story about the DVD version:

Is it satisfying that Empire has been changed the least of the original trilogy with the 1997 Special Editions and DVD release?

When the film was released in 1997 and later put into DVD, I was very gratified that it was almost unchanged, except the sound was much improved, whereas Star Wars and Jedi had big changes.

http://www.vanityfair.com/online/oscars/2010/10/irvin-kershner

Doesn't ESB actually have the most changes, but just the least noticeable when compared to SW and ROTJ? I find the additions to the Cloud City escape just as bad as some of the "big" changes in the other films as they completely ruin the pace and flow of the scene.