Wallace made a brief appearance in the sitcom Scrubs episode "My Words of Wisdom" (2007), and in the sitcom Seinfeld episode "The Checks", where he played the doctor that was distracted by the song "Witchy Woman". He also appeared in the introduction scene to the home video release of Jerry Seinfeld: I'm Telling You for the Last Time - Live on Broadway (1999) as a fictionalized version of himself. He portrayed a man in a retirement home in The Last Laugh (2019) and starred as the Mayor in Hubie Halloween (2020).