Haven’t seen this mentioned elsewhere, but did anyone notice in Rey’s vision, at one point you can hear Luke screaming- I think it’s either him screaming “Noooo!” after Vader says “search your feelings, you know it to be true” in ESB, or it was him screaming in pain as the Emperor electrocutes him in ROTJ.
Anyway, pretty sure they used a Luke scream from the OT in that scene.