Mandel also appeared in Word of the Day segment during Sesame Street Season 38, discussing the word "ticklish." In the same season, Mandel was caricatured as Howie Eatswell in a parody of Deal or No Deal.
In 2010, Mandel became a judge on America's Got Talent, which featured multiple appearances by the Muppets over the years.
Mandel's other TV credits include the role of Dr. Wayne Fiscus on St. Elsewhere for the entire run of the series (1982-1988) and the voices of Bobby and Dad Generic on the animated series Bobby's World, which Mandel created, as well as guest spots on Lois & Clark: The New Adventures of Superman (as Mxyzptlk) and The Outer Limits. Films include Gremlins and Gremlins 2 (as the voice of Gizmo), Blake Edwards' A Fine Mess, Little Monsters, and Tribulation.