While we're at it, I'm having a HELL of a hard time finding that script for the first live action movie everyone's constantly referencing. :-\
It was scrubbed from the net pretty shortly after its release. Pretty hard to find now in public, though maybe someone has a copy and there was a ton of discussion regarding it once it was leaked, which is where most people remember it from, I think.
Well, I'd never REQUEST it since that could possibly be flirting danger...I guess. But I need it like crazy. >_> <_<
Because so much changes between whatever draft is available and what ends up onscreen, obviously. For the first film at least it was a MUCH earlier draft which was rather significantly revised that finally leaked online. And, hell, if you've seen ANY of the special features for ANY of these movies then you should be well-aware of how much on-set improv takes place. That alone means the dialogue is at least quite different. But frequently there are a great many more large-scale changes. The script for TF otM would of course most likely have The Twins and such. And, hell, the treatments and "scripts" for TF:RotF would be FASCINATING to see, given the peculiar nature of THAT particular production! Ahhh, someday...
Everything in that link is either dead, not linked at all, or merely typed out dialogue from the finished film. That's not a script, that's a transcript.