The different 70mm versions of ESB are another story altogether. These differences, however slight, are fact and well documented. If I recall correctly, there were some alternate angles and cuts in the bacta scene and different transitional effects during the scene with Luke on his tauntaun. I actually saw this version when the film opened at the Cooper in Denver. But I would never rely on my own memories alone.

So, you're saying that around 1983 an issue of "Bantha Tracks" (the old fan club newsletter) contained mention of the Chewie/mouse droid scene being missing from some early prints? That time frame would be somewhere around issue #20. I believe the old issues are archived for Hyperspace members. Perhaps someone with a membership could have a look around?