Well, I can imagine it's almost impossible to remember this sort of differences in the films, it was also a different time back then when you didn't have different versions of the films to worry about in your mind, you just went to see The Empire Strikes Back and had a wonderful time, not wondering about if anything was different in the presentation.
I also doubt they created new 70mm prints, afterall they were really expensive, but it was just a thought I had.