- After Dr. Meacham has arrived at the secret lab in Georgia and the scientists are having a dinner, a woman comments the music playing at the background by saying: "Mozartti on oikein kaunista." This is Finnish and means "The music of Mozart is very beautiful."
- The only woman from Metaluna seen in the film is played by Charlotte Lander, in her only screen appearance, at the control console for the decompression tubes on board the saucer.
- A print of this film was loaned to MGM where another science fiction spectacle, Forbidden Planet (1956), was being prepared.
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