When the Robot is going haywire, he spouts gibberish including the phrase "Klaatu barada nikto". This is the robot password from The Day the Earth Stood Still (1951). He also at one point claims to be Robby the Robot who first appeared in Forbidden Planet (1956).
The American flags used in the frame story were obsolete before the series was filmed. The small ones on Pat Paulsen's desk have 48 stars (World Wars era), while the large flag has only 35 stars (Civil War era). Since 1960, the flag has 50 stars.
The weapons that the aliens use are Astro-Ray guns from Ohio Art painted white and gray instead of the customary red and white colors.
There seem to be elements borrowed from Plan 9 from Outer Space (1957). The male-female team of alien invaders, with their grim determination contrasted with pathetic incompetence, resemble the characters Eros and Tanna from the film. Host Pat Paulsen's performance, delivered dreadfully on purpose, appears to be based on Criswell's ludicrous narration.
Michael Nesmith was unavailable during the bulk of the shoot, but appears on camera for the first minute and one brief subsequent shot. Uniquely for the series, he appears without ever assuming his usual Monkee persona. Instead, he is one of the G-men from the Federal department of UFO watchers headed by Pat Paulsen. These scenes appear to have been added at a later stage to pad the story out to a usable length.