Since I saw SW in 77 four times, my memory of the Biggs scene is quite specific... I remember the reunion making me think I must not have been paying attention earlier, because I didn't know who this guy with the mustache was. It seemed like an important reunion, and he should be someone we had been introduced to before. I also remember the third guy in the scene looked like a friend of mine at high school. I also always remembered Luke being a sort of mini-celebrity in the hangar before the trench battle because of who his father was, but without that scene it's not the case.
I saw SW in 1985 at an all-night trilogy marathon, and I'm pretty sure it didn't have the scene. I remember thinking that some things were different in the hangar.
I didn't read the novel until about 2 years ago.
The first home video version I bought was the faces vhs tape, and I remember being disturbed that if that scene was missing (and "close the blast doors", and the missed grappling hook, and that Vaders getting blasted out of the trench being extended for continuity), there must be other stuff missing or changed too. In exploring that issue, I started learning more about the movie, such as the different soundtracks, which later explained most of the things. I'm satisfied with every explanation now, except the Biggs scene.
FWIW, I saw the movie in 1977 in Logan, Utah (3 times) and in Sacramento, CA (1 time in 1977 probably in 70mm, 1 time in 1983 in 35mm). I used to be jealous of people who saw it in 70mm, but now I think I may have seen it in 70mm because the theater in Sac had 4 screens that were 70mm-ready.
Anyone here ever try to follow up on this guy:
http://www.stevehoffman.tv/forums/archive/index.php/t-141011.html