I've never heard about that clone bit before. Do you have a quote? Not that I don't believe you, I just want to see what he said. I would cut it all out. I don't think there needed to be that continuity explanation. "Bring my shuttle" explains why Vader was then on the Star Destroyer well enough without needing to see all of it. It's also a much better character moment. The growling way he said it, and the fact that he was clearly pissed off, shows his reaction to Luke doing something unexpected: throwing himself down the giant shaft, and escaping Vader. Good point about the message to Jabba. I agree, it should be in there then.