Al Molinaro as Al Delvecchio made a cameo appearance in the 1995 Weezer music video for their single "Buddy Holly", where the band were portrayed as playing at Arnold's.
The series also starred Ellen Travolta as Louisa Delvecchio, Chachi's mother, and Al Molinaro as Al Delvecchio, Chachi's stepfather (and formerly the owner of Arnold's Drive-In in Happy Days), who opened a restaurant in which Chachi and Joanie performed most of their music.