Johnny Pop's character name is misspelled "Watchtman" in the end credits.
Fat Augie Strom appears to be loosely based on a real-life Chicago gangster named Joe Saltis whose territory included the Chicago stockyards.
Ness: You're 15 minutes late.
Remp: I stopped to rob an old lady.
Ness: Who hit Laffey?
Remp: Nobody said and I didn't ask.
Remp: Take it easy, Ness. Rome wasn't built in a day. I just started building this morning.
Marcie: (about the fur) It must have cost a fortune.
Remp: I stole it from an old lady.
Augie: You're a sweet fellow, Ness.
Ness: I like to spread happiness wherever I can.
Bitsy: (to Remp) Augie's gonna hang you like a side of beef.
Remp: (carrying Bitsy's body) A present from me to you, Augie.
Marcie: Is this what Ness did for us?
Remp: He put us on top of the heap. We can send him a case of champagne for Christmas.
Marcie: You killed a man.
Remp: A bug. I stepped on a bug.
Hobson: Somebody oughta go with you, Eliot.
Ness: I may not want any witnesses.
Ness: Where is Al, Mrs. Remp?
Marcie: (pulls a gun) Where you put him.
Up until now, The Untouchables were filmed in pure black-and-white. Starting with this episode, they now had a sepia tone to them. Color television was still a little way off, and most shows would not be filmed in full color until 1965.