This is the first of two appearances Jeremy Slate makes in the series, each time playing a different character, but each time playing the part of a hoodlum involved in a plot to assassinate Eliot Ness. His second appearance occurs in A Taste for Pineapple (1963).
This is the second of three appearances Mike Kellin makes in the series. In each appearance, he plays a different role. His other two appearances occur in The Noise of Death (1960) and City Without a Name (1961). He is perhaps best remembered to 1960s TV audiences for his recurring role as CPO Willie Miller in the series The Wackiest Ship in the Army (1965).