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The Tales of the Jedi comics developed the Jedi and the Sith.
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There was only one Dark Lord of the Sith at a time and it was Vader, not The Emperor.
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Jedi and Sith had all different lightsaber colors.
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“Darth” would remain a first name that Anakin used as part of an alias rather than a title.
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Boba Fett was Jaster Mereel.
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The Jedi were implied to be more secretive. It seemed that the average person wouldn’t know who Yoda, Obi-Wan, or Anakin were or what “The Force” is.
Owen and Obi-Wan being brothers is only in the Kasdan drafts of ROTJ’s script and not in the movie itself, so I think it’s a Kasdan idea that Lucas didn’t go with.