In this episode, Enrico, played by Nicholas Georgiade, revisits his former talents as a barber, a profession he exchanged for his career as a federal agent with Eliot Ness in the first season of the series in The Empty Chair (1959).
This is the seventh of eleven appearances Joseph Crehan makes in the series, each time playing a different character.
This is the first of three appearances Hank Patterson makes in the series, each time playing a different character in some way on the wrong side of the law. He is perhaps best remembered for his recurring role of Fred Ziffel on the 1960s TV sitcoms Petticoat Junction (1963) and Green Acres (1965). His other two appearances on The Untouchables (1959) occur in The Jamaica Ginger Story (1961) and Doublecross (1962).
This is the fifth of eight appearances Frank DeKova makes in the series. Except for the first season, when he appears as Louis Campagne three times, all his other appearances are in the roles of different sinister characters, roles he frequently played throughout his acting career. Even so, he is perhaps best known to audiences from the 1960s for his recurring role in a TV sitcom as Chief Wild Eagle from F Troop (1965).
This is the third of six appearances Nehemiah Persoff makes in the series and one of three appearances in which he does not appear as Jake Guzik.