It still weirds me out to watch "Ex Machina" with Oscar Isaac and Domhnall Gleeson (Hux) playing entirely different characters from their SW counterparts. And I knew I recognized Lor San Tekka (Old guy with Luke's map, for those unaware), and later found out he was the older priest in "The Exorcist."
I remember after seeing "Phantom Menace" as a kid, I could never watch another movie with Liam Neeson, Ewan McGregor, or any others without feeling this uncomfortable sense that they did not belong there.