And don’t forget that one of our OT members made an audio recording of a 70 mm showing. Few of the audio changes claimed are actually from the 70 mm version.
Basically none of the dialogue changes on the Wiki page. Two alternate dialogue takes, a few mixing differences and some changed around sound effects.
From what I can tell from the tape recording;
- Luke’s lightsaber has a very audible deactivation sound as he runs out of the Wampa cave.
- The Battle of Hoth uses a few different sound effects, including TIE laser sounds for the Snowspeeders.
- Threepio’s ‘and’ before ‘Do take good care of yourself’ is clearly audible.
- I might not be right about this, but it seems like there’s a low rumble effect for the space shots of Artoo during his conversations with Luke. I don’t recall other mixes having that.
- Perhaps some extra (or louder) explosions during the Asteroid field chase.
- There’s a neat ambient effect during the Emperor hologram that I’m not sure is quite replicated in other versions.
- Different, louder TIE sound effect in the shot before Needa’s death.
- Probably due to the increased range over the stereo mixes (but maybe betrayed by the nature of the tape), Threepio’s lines throughout a lot of the third act are far more prominent, though still contain the atmospheric effects present in the stereo mix.
- Aside from the length differences, both of Lando’s lines in the final scene are different takes.
Most of the alternative dialogue we know about seems to come from a never-released mono mix.