John Howard is introduced as Steve's boss Dave Welch and would play the role for the next two seasons. In the storyline he is Vice President of the Engineering Department, and Managing Director.
William Demarest and Joan Blondell had recently appeared on a 1964 episode of "The Twilight Zone" ('Whats in the Box'?) as husband and wife. Demarest plays the henpecked husband who kills his wife and is sent to be executed in the electric chair!
A continuity blooper is heard here when Charley mentions his wife. Charley is supposedly a retired Sailor who has sailed the world and never married, although Demarest was married in real life.