hairy_hen said:

Pretty surprising to me that the error in the cave scene was actually there originally. That and the laser sound during the battle are things that were fixed for the 35mm, because they seem to be actual mistakes. However, I don't know why the TIE fighter engine sound would have been removed.

Yeah, I doubt you could actually see Luke deactivate his saber in the 70mm version but you never know. ;) The difference in those TIE engine sounds are a weird one, the 70mm mix sound so much better to me in this case, the familiar roar we're all used to hear, the TIE's in the 35mm mix sounds very weak and not at all how we're used to hear them.