Three characters' names - Puppis, Bootes and Lacerta - are based on constellations, but not zodiac constellations, as the Colonies are. Puppis is the stern of the Greek ship Argo, Bootes is a charioteer, and Lacerta is - quite appropriately - a lizard.
The Old West frontier-style town set used in this episode will be seen again in "The Long Patrol" and "The Magnificent Warriors".
The music played in the saloon is a whimsical rendition of Scott Joplin's "The Easy Winners" (published circa 1901).
Befitting of a world paralleling the Old West, the planet name Equellus is similar to the word Equus, which is Latin for Horse.