In the scene in Arnold's where Butch is insulting Fonzie, and Fonzie keeps fighting his urge to fight back (with Ritchie's encouragement), you can see Joanie in the background taking off Fonzie's leather jacket, as she knows that Fonzie is about to snap his fingers and call for her to give back the jacket.
In the scene in the Cunninghams' house where it's suggested that Fonzie see a psychologist, Joanie says he's the first person she knows who's ever seen one. However, in Season 2, episode 4, Ritchie goes to see a psychiatrist .