Most of the cast came from Broadway shows of the time.
Most of the film was shot in an abandoned aircraft hangar on Long Island, New York.
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.
The Air Force stock footage seen as the military "pursues" the Martians is the same footage used in the opening credit sequence of Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb.
The Martian guns are actually painted Whammo Air Blasters.
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.
This was Pia Zadora's debut.
Was made "popular" following its critique on the program Mystery Science Theater 3000.
When Santa starts making toys, one of the Martians is fascinated by a toy that's "a coiled spring that walks down stairs." The year this film was released (1964) was a huge year for Slinky, which had a resurgence in the early 1960s.