An in-joke occurs during the fourth-season episode "Where Are the Sounds of Celli Brahams?" In this segment, Horace McMahon guest-stars as a Minneapolis, Minnesota, festival promoter. His character confesses to Linc his failed ambition to be a policeman. Linc remarks that he resembles a policeman Linc once knew in New York City. McMahon had starred as Lt. Mike Parker from 1958 to 1963 on the New York-based police drama Naked City, another series created by Silliphant and Leonard.
