One thing that every edit needs to cut out:
Finn’s “Who do you think mopped up on that Star Destroyer?” comment (or whatever it was he said).
I didn’t mind the “sanitation” thing in TFA, since it was implied that he was only in sanitation while stationed at SKB, and he almost certainly had other, more stormtrooper-y posts when he was stationed at other locations.
But TLJ implying that he was also in sanitation on that Star Destroyer implies that a janitor is all he ever was. Which doesn’t sit right with me at all.