You-Too,
I really think you're on to something here. I always suspeceted that there was an overall color change to the entire ANH, and maybe to all of the sequels, as the same color push seems to be everywhere. It's possible that individual shots were color re-timed as well, but I bet there are not very many, as that seems like a lot more work than what otherwise has been put into the DVD and BR releases.
I know you mentioned that you changed some greens and blues, so this may be resolved already, but the light green leaves in the back during the awards ceremony look too neon in your posted pics. I'd be curious to see what it looks like again with your new settings.
Please keep up this AWESOME work, and keep posting pics!
BTW, I have to agree with some here that the Technidisc transfer that mysycamore did is about the best color reference there is. Might want to do some comparisons with that.
-G