Garry Walberg (who later appeared with Klugman on the series "Quincy M.E.") as "Speed", and Larry Gelman as Vinnie, each made several scattered guest appearances after the first season. Richard Stahl appeared in nine episodes as, among other things, a pet-shop owner, a florist, a psychiatrist, and a non-denominational monk, never playing the same role twice. Actor Herbie Faye appeared five times on the series in different roles. Oscar's mother appeared in two different episodes, played once by Elvia Allman, and once by Jane Dulo, both veteran actresses.