I'm pretty sure that Vader flying off at the end wasn't there when i first saw the film too. I can also remember that my Dad bought me a Darth Vadar Lives badge right after we saw it in Birmingham. I was surprised to see him flying off a week later when we went to see it at a different cinema. But that was the only difference (apart from the fact that the second showing was the mono mix so i noticed the extra/ different lines ). there wasn't the Biggs scene or the missing grappling hook. For the first showing i took my portable tape recorder and use to listen to the film every night so knew the film off by heart by the time i saw it the second time.