Off the top of my head:
- A Threepio line that hadn’t been updated with the most recent model
- Color correction on Ahch-To
- We re-did Luke’s dialogue on Ahch-To to the following: “She was quick to learn in our training. But Leia feared the hatred that consumed our father, choosing instead to follow our mother’s path. By training you as a Jedi, she confronted her fears and embraced love over hatred. A thousand generations live in you now, but this is your fight. Let Leia’s legacy guide you on Exegol.”
The goal with the last change there was to make it clear Luke is referring to a thousand generations of Jedi, and also subtly suggest that Leia’s fear of becoming a bad Jedi was what stopped her from training her son and sending him away to Luke. To which she amends by training Rey.