aTmAg said:
Any superfans know if Lucas wrote the dialog for OT? Or did he have help with that? The difference between OT and the prequels is night and day.
Lucas wrote like 6 drafts of SW - he certainly wrote the original story. By the end it bore little resemblance to the original though. And even he admits he wasn't good at dialogue. He had a lot of help and after the 3rd draft or so he even brought in others to "polish" the dialogue specifically. He says about 30% of the dialogue in SW was redone by them. (Probably more). then on set Harrison Ford especially was infamous for calling Lucas out on th dialogue and told him paraphrasing something like "you can write this ****, but you sure as hell can't say it" and he would write his own notes in the margins of the script and change things to sound more natural. Guiness and Fisher also took more liberties with their lines it is said.
On ESB he specifically hired a screenwriter (who tragically died after the first draft). He had the story treatment mapped out but she wrote the script. He then wrote the 2nd draft. He then had Lawrence Kasdan take over and he handled the later rewrites. Kasdan also wrote most of RotJ I believe but I'm not sure about that. Again the actors also took a lot of liberties with the dialogue on set.
I really don't know on the prequels - my recollection is that he had much more control and the actors stuck much more to what he had written. It was known as a very stoic environment working in front f blue screens and ther was little dynamic acting per se. But I'm not expert on those really.