Happy Days

In one episode the Cunninghams are coming out of a theater playing Vivir de ilusión (1962) when Mrs. Cunningham comments that the little boy in the movie looks just like Richie (Ron Howard) when he was little. Mr. Cunningham replies that she's being silly and that the boy in the film looks nothing like Richie. In fact, Howard did indeed play the little boy, Winthrop Paroo, in the film, when he was eight years old.

Both Micky Dolenz and Michael Nesmith of The Monkees auditioned for the role of Fonzie. However, both were considerably taller than the other main cast members and the producers decided that the Fonzie character should be more at an eye level with his peers. A search for a shorter actor resulted in Henry Winkler's hiring.

Although Fonzie loved motorcycles, Henry Winkler was terrified of them. Most of the scenes of Fonzie riding the motorcycle were shot with the bike attached to a platform, and being pulled by a truck.