I have some ideas:
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Remove Sidious revealing that he created Snoke, as well as the shot of Snoke bodies in the bacta tank or whatever. Make a new opening crawl for The Force Awakens mentioning that Snoke was some dark-side warlord or whatever and formed the First Order, modeled after the Empire.
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Remove the shot of Rey and Ben kissing.
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Remove every single mention of Rey being Sidious’ granddaughter.
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Remove the audio clip of Mace Windu, because neither Qui-Gon or Yoda taught him how to become a Force ghost.
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Insert Anakin, Obi-Wan, and Yoda at the end with Luke and Leia. (No, it shall not be footage from the previous films, so it wouldn’t be obviously green-screen of footage from the previous films.)
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Imply that Sidious is some sort of zombie.
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Remove the old lady asking Rey who she is, and her saying that she’s Rey Skywalker.
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Remove the shot of Rey’s yellow lightsaber. Why? The Sith and other dark siders are gone forever, so why have Jedi anymore?