1) If Boba now talks with an Aussie accent, why don't any of the Storm Troopers, some of which at least, are his clones?
2) Why does the Emperor in ESB look much older and talk slower than he does in ROTJ?
3) But look at it from Luke's point of view. He's thinking, oh look there's Obi Wan on the right, and there's Yoda in the middle and, hang on, who the hell is that bloke on the left?
Don't get me wrong, a few of the more insane Lucas Fanboys gave it a shot, and some of their explanations for the "Hayden Ghost" defy all known forms of logic. Some of these people really need to move out of their parent's basement.