A "Dr. Adam Strange from Alpha Centauri" is paged on a P.A. in this episode. Adam Strange is a DC comics character and his adopted world, Rann, orbits Alpha Centauri.
The set for the generating plant control room was built using the walls and other elements from the Wildfire lab sets in The Andromeda Strain (1971).
At approximately eighteen minutes there is a scene in a spaceport. There is an announcement over the PA of a flight leaving for Thanagar. In DC Comics continuity (one version at least) Thanagar is the home planet of the superheroes Hawkman and Hawkgirl.