Anakin's last words to R2 on Mustaphar were "Stay with the ship". In the ESB novelization, Luke notices that R2 always gets anxious when he's told to stay with the ship...

Doesn't matter if Georgie planted that in there (who knows if he read the novelizations) or it's just coincidence, I love when this shit happens in the Star Wars universe. via /r/StarWars https://ift.tt/2K94DW1