I can attest to the fact that shots of Leia, Han, etc., observing Luke in the medical center were not in the 1980 70mm version. I only saw those production stills taken on set after the film's run.
I believe what you say, and Mattessino's list of 70mm differences are also very trustworthy IMO, this guy apparently saw both versions of Empire in theatre about 70 times in 1980 and all his observations about the audio differences have since turned out to be true.
Apparently most of the SE dialogue changes really were just revisionism,
Yeah, the mix was already perfect IMO, they just changed it for the sake of making it different it seems. One of the best things about the original mix that I think they totally destroyed with the SE-remix, are the subtleties in dialouge which makes the original sound so alive, take Yoda's teachings to Luke when he is on his back for example, where the surroundings intrude on the dialogue levels when they cut to R2, or when C-3PO on Chewie's back "I’m not supposed to know a power socket from a computer terminal" dial out in level as he is now further away from the action.
There are many examples like this in the original, but when it comes to the SE they just mixed the lines of dialogue at the same audable level no matter what happens on the screen. And the result is amatuerish and sound more like a bad dub in many instances. The only thing I like about the remix is the two intended musical transitions to the Imperial fleet.
If msycamore says the length of the bacta tank scene is exactly the same, I believe him, because it certainly sounded that way to me. They must have simply edited the picture differently but kept it the same length.
I didn't make a truly exact comparison down to milliseconds though, just let the audio play over the GOUT video and it seemed to match up perfectly in lenght, so I guess the scene was just re-edited with the same audio supporting the scene.
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