 Ralph goes off to college and this serves as his last appearance in Happy Days.One small continuity error remains with the character of Ralph's father.Originally, his father owned a woman's dress store in town and his name was Harry Malph (played by Mike Monahan in the first-season episode "Because She's There"), but when the show shifted to a studio audience format in the third season, Ralph's father was shown to be an optometrist, Mickey Malph, played first by Alan Oppenheimer and then subsequently and more famously by Jack Dodson.