There was never meant to be three movies anyways. So clearly George made up the other films and claimed his first draft was split into three movies for time constraints. He got lucky only once.
Everyone knows SW was never meant to be episode IV until after Empire came out, so the PT was never meant to exist until George decided to make them in the 90s. When he made them it was clear to everyone that he haven't seen the originals in years, hence the obvious contradictions.