I remember thinking when ANH:R came out that ESB:R would not take very long... Because I thought the film really did not need too much changing with it apart from the color correction and a few edits and replacement matte paintings.

Only after it's totally scrutinized and you look at the change list on the first post you realize how much potential tweaks and improvements there are.

My mind can only Boggle at the size of the ROTJ:R change list it's probably twice as long as ESB:R already if there is a rough list

And the prequel Trilogy films that is an impossible calculation at the moment.

Anyway I just went on Jim Henson's creature workshop to have a look and surprisingly when you click on the films tab Star Wars does not get a mention?

I wonder if there is some sort of breech of contract that they are not allowed to claim rights to creative services being an outside company from lucasfilm?

you can see the film list here

http://www.creatureshop.com/productions_film.php

I just think it's a bit strange that they did not credit that film to the list... As who would not want to associate themselves with working on the original star wars trilogy? Which makes me think that they can not on legal grounds?

*Edit*

Just found this on Wiki

Despite assumptions to the contrary, Jim Henson's Creature Shop was not responsible for any of the non-human characters in the Star Wars series. The Star Wars creatures were created in-house by Stuart Freeborn in England and at Industrial Light & Magic, George Lucas' special effects shop. Jim Henson and his team, regardless were consultants for the Yoda puppets and Frank Oz, one of the original Muppeteers, performed him.^[1] Henson and Lucas did collaborate on the 1980s cult classic Labyrinth.

I Actually never new that but I thought I would leave this up for others.