In the opening scene, in which the jazz trio "The Wasps" perform for the Marineville personnel, the brand of piano the pianist plays is a "Graystein" - an in-joke referring to series composer Barry Gray. It is also presumably Gray's hands that are seen playing the piano in the close-up.
The Wasps jazz numbers are played by Gordon Langford (piano), Alan Ganley (drums) and Joe Mundele (bass).
The radio used by Lieutenant Grey to communicate with X20 was previously seen in Marineville Traitor (1965) as Commander Shore's concealed radio transmitter.
This episode is one of only three where Surface Agent X-2-Zero appears in an episode without King Titan. The Other episodes are Tom Thumb Tempest (1965) and Rescue from the Skies (1965).
This episode was the 31st episode produced and the 13th broadcast.