I think in certain job quest cutscenes they actually have the player character do certain actions, because the player is guaranteed to be that job when they first view it (unless skip potion), e.g. Twin dragonsong dive on Fauhnem in the lvl 70 Dragoon quest, or the dance with Rhaana Mhigo in the lvl 80 Dancer quest. I have no idea how these scenes are animated if you are on a different job when you view them in the Unending Journey, or if they are in the Unending Journey at all to skip any problems being a different job would have in those scenes.