OK, sorry guys, the frame actually isn't missing on the BD, I made a mistake there. Sorry for the false alarm. However, I put the 2006 DVD, '97SE and the BD all side by side (I unfortunately don't have a usable file of the '81 version at hand, so I can't speak to that) and synced them by the first frame of the first shot of the inside of Tantive IV (with 3P0 and R2) and everything else seems to be in perfect sync too - the crawl starts on the same frame, all the laser shots and flashes appear in the same frames, so the audio should be perfectly in sync as well.