* CreatorsOddball: This movie was made by Hammer Films, best known for their Film/HammerHorror productions with vampires, Doctor Frankenstein, the supernatural and so on.
* ScienceMarchesOn: In many ways:
** The film runs with the "asteroids are the remains of an exploded planet" theory, which modern science has largely discarded.
** The film was made before the Soviet Union's ''Venera'' series of unmanned probes revealed just how hostile the surface of Venus is. Colonies? Not any time soon.
** There are ice-mines on the Moon. Science marched away from this idea, but if you hear returning footsteps, it's because of new discoveries.