At the end of the episode, in the fight scene between Eliot Ness and Leo Stazak, the stunt double for actor Telly Savalas is obviously wearing a very fake-looking "bald" cap.
Narrator: Shortly after the capture of Leo Stazak, Frank Nitti went to jail for income tax evasion. During his 18 months imprisonment he received word that Stazak had been executed for murder. Nitti let bygones be bygones. He sent flowers.
Leo Stazak: So they give me a few years. Time off for good behavior.
Ness: A whole lotta years. Time off for a walk in the exercise yard.
Hobson: (notices Leo Stazak entering the steam room) He's looking for Nitti.
Ness: Can't be courage. Just plain nerve.
Ness: (after showing Nitti the phony stock certificates) Have a nice steam.
Nitti: (to Leo Stazak) Every time I look at you, I see flames.
Nitti: I like you, Leo. You got guts. If there's one thing Frank Nitti appreciates, it's guts.
Nitti: I don't like these sessions, Ness...you operate like a cheap hood.