When Harry Guardino, playing Frank O'Dean, leaves the coffee shop, he opens the glass door, grabbing the door frame showing that there is no glass in the door.
Revealed in this episode is the replacement of Agent Martin Flaherty by Agent Cam Allison. Flaherty was promoted to head the Cleveland office of the Bureau of Prohibition. He was played by Jerry Paris, who in real life went on to play the recurring role of Petrie family neighbor and friend Jerry Helper in the 1960s TV sitcom The Dick Van Dyke Show (1961).