Just 2 months earlier, R.G. Armstrong appeared in The Brand Release (1959) as the bad guy. This was his second and final series appearance.
One of the few times that both John Russell and Peter Brown appear on screen as their names are credited.
There is an allusion to romance between Catherine McLeod (Cynthia) and Robert Conrad (Davey). McLeod was 14 years older than Conrad, and 4 years younger than her on-screen husband R.G. Armstrong.