I saw Alec Guinness interviewed on the David Letterman show (on Youtube), and he mentioned that he was given the script to Star Wars shortly after he finished filming Murder By Death.
He said the dialog was terrible but that he couldn't stop reading the script, which caused him to get interested in the project.
What version of the Star Wars script was Alec Guinness reading?
I'm asking because he might have read an early draft of the Star Wars script that didn't resemble the final film.