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Lucas showed a roughcut of Star Wars to his friends: Steven Spielberg, Brian De Palma, Gloria Katz, Willard Huyck, John Milius, Matthew Robbins, Hal Barwood, and Time magazine film critic Jay Cocks. They were merciless and he made many a few wise changes thanks to their advice.
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All of this is pretty well documented, although good luck getting Lucas to step up and admit it.
this part is well documented in the Empire of dreams doco. Speilberg was the only one who liked it