- Because the budget was so low, Ray Harryhausen removed two arms from the octopus to save money on the effects. He made the creature appear as if two arms were always in the water, making it appear that it had eight arms.
- This is the film that brought together producer Charles H. Schneer and special effects legend Ray Harryhausen. Their professional relationship would last until Clash of the Titans (1981), the final feature for both men.
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