This is the second of three appearances Ray Kellogg makes in the series. He plays a truck driver here; in his other two appearances, he assumes the role of someone in law enforcement: Search in a Windy City (1964) and Concrete Evidence (1967).
This is the first of three appearances Joanna Moore makes in the series, the other two appearances occurring in Crack in a Crystal Ball (1965) and Nobody Loses All the Time (1966).
This is the first of three appearances Paul Comi makes in the series, each time playing a different character. The other two appearances occur in Middle of a Heat Wave (1965) and The Judgment: Part I (1967).