In the episode where joanie and fonzie do the dance contest against the head cheeleader for joanies school (charlene tilton) joanie it seems is going out with a guy named Jimmy played by marc mcclure, aka jimmy olson superman the movie, but in another episode where joanie dresses up in leather and joins that biker club the red devils, marc is in that episode too but they changed his name to roger and yet he seems like the same character he played in the dance contest episode, there is probably not an answer to this question but I was just wondering.