In the original theatrical release of the movie, after Luke is taken out of the Bacta tank, the medical droid is seen taking a sort of mask off of Luke's face.
A deleted scene that made it to a trailer shows C-3P0 on the ice planet of Hoth tearing a decal off a door where the rebels have contained the dreaded wampas.
When the film was first released, the scene at the end when the Millenium Falcon is docked to Home One and the camera pans to the medical ward window was different. It later changed after the initial release because George Lucas thought that there was some confusion as to where the Falcon was in relation to Luke and Leia in the medical ward.
The Super 8mm abridged version has different takes of Luke talking to Han whilst astride his tauntaun, and Han saying 'watch this' as he tries to jump to hyperspace in the asteriod field. Although the dialogue hasn't changed different emphasis are put on certain words.
by the way jambe don't know if you have hyperspace but they just put up some empire interviews in their audiocast section in mp3. These were they pre-recorded open ended interview reponses sent out to several radio stations/talk shows in 1980 0n lp. They go for quite a bit when on ebay.