Personally I'm very much on board with the notion that the clones of ANH "clone war" fame (long before the prequels came out) were more of a "you never knew exactly who you were dealing with" kind of situation...whether the real person or a clone of said person.....I think it was quite the wasted opportunity for GL to box himself in by making the troopers the ONLY clones (like no-one else had ever thought about cloning people for other purposes........how interesting would it have been for Obi to have been investigating who ordered clones in the first place only to find out that it was a clone of himself....thus leading to him fighting himself...blah blah blah....and then leading to a complete ban on cloning (for obvious reasons) thus explaining why it doesn't play a part in episodes 4-6)....the same way it was boxing himself in story-wise to say that only 2 Sith could ever exist at the same time....BORING.
Additionally, Palpy tossing out Vader's name before Vader appears......this is rather awesome.