The film's leading ladies, Ana Bertha Lepe and Lorena Velázquez, were crowned Señorita México (Miss Mexico) in 1953 and 1960, respectively.
Mórbido Film Festival programmer Abraham Castillo Flores explained in a lecture on Mexican horror cinema that the filmmakers in the era that produced this film reveled in their low-budget production values. Those directors wanted to show off the wires and cheap special effects as a kind of badge of honor--they could make monsters fly, and here's how they did it.
Some of the special effects (such as the spacewalk) were taken from the Russian speculative documentary Doroga k zvezdam (1957)' ("Road to the Stars").