Six years prior to this, James Best guest starred in Merry-Go-Round Case (1957) with David Janssen. Later, they would both appear on The Scream of Eagles (1979).
This is the second of 3 times Billy Halop appears on the screen with David Janssen. Each time he plays a minor role and each time it is as part of the cast of a TV show headlined by David Janssen.
This is the first of two times that Jack Klugman appears in this series; each time, the character he plays is the owner of a business. His second appearance occurs in Everybody Gets Hit in the Mouth Sometime (1965).
This is the first of three appearances Elizabeth Allen makes in the series, each time playing a different character. The other two appearances occur in Detour on a Road Going Nowhere (1964) and The Evil Men Do (1966).