According to the Medved brothers' book "The Golden Turkey Awards", director Phil Tucker attempted suicide after the release of "Robot Monster", due to the overwhelmingly negative critical reaction it received.
After the lightning flash, we see dinosaurs battling, and the footage comes from other films. The large lizards are from One Million B.C. (Hal Roach, 1940), supervised by Roy Seawright; the one brief shot of two stop-motion triceratops fighting is from "The Lost Continent" (Lippert, 1951), animator unknown.
Close examination of the Ro-Man's helmet reveal it to be very similar to the helmets worn by the moon-men on the lunar surface in "Radar Men from the Moon", a serial from Republic released in 1951.
Is considered to be the first science-fiction film with stereophonic sound.
It was reportedly shot in just four days, utilized no sets, and was entirely filmed outside.
One of the films included in "The Fifty Worst Films of All Time (and how they got that way)" by Harry Medved and Randy Lowell.
Originally released in 3-D.
The film was not entirely filmed at Bronson Canyon. The scenes at the ruins of the home were shot in a residential hill area elsewhere.
The scenes on the view screen presented by Ro-Man, come from a variety of sources: among them, the shots of New York in apocalyptic ruins are matte paintings by Irving Block from Captive Women (RKO, 1952); the shots of the headquarters of the Great Guidance (a rocket ship in launching position) was originally created for Rocketship X-M (Lippert, 1950), also painted by Block.
This film is listed among The 100 Most Amusingly Bad Movies Ever Made in Golden Raspberry Award founder John Wilson's book THE OFFICIAL RAZZIE® MOVIE GUIDE.