ANH: Replace Alec Guinness with Ewan McGregor from the near future
ESB: More Fett
ROTJ: Have the construction on the DSII actually make a bit of fairly noticeable progress during the movie.
TPM: Remove Jar Jar and find some other way to get to Theed that would still be semi-exciting.
AOTC: Remove mention of Death Star and save the reveal for ROTS
ROTS: Put all the deleted scenes back in.
TFA: Snoke is Plagueis (just for the heck of it.)
TLJ: DJ stays with the good guys the whole time
TROS: New script that actually redeems the ST after the abysmal TLJ.