TPM: The face and voice of Sidious’s hologram are completely distorted so Dooku could be a credible red herring for the identity of Maul’s Sith Master.

AOTC: Instead of being a generic pacifist, Padme shares Anakin’s belief that a stronger, more aggressive chancellorship is necessary to prevent tragedies like the ones they experienced in TPM. They bond over this, and their relationship will eventually sour when Padme realizes Palpatine’s going too far and Anakin doesn’t.

ROTS: Include Yoda communing with Qui-Gon.

ANH: Don’t reveal that the Empire’s new weapon can destroy planets in the opening crawl. Let it be a horrible surprise teased then eventually revealed with Alderaan’s destruction.

ESB: Um, gee, I dunno…Dash Render cameo in the Battle of Hoth, maybe?

ROTJ: A more age-appropriate Hayden Force ghost not made from recycled footage.

TFA: Cut out the references to Han and Leia being separated. They suffered a tragedy with their son’s fall, but faced it together.

TLJ: Once Carrie passed away, rework the ending to delay Luke’s death until IX.

TROS: Does “scrap the entire script before filming” count as one thing?