- In order to get the lizards to move, heaters had to be turned on full blast because reptiles don't move in cold weather.
- When the film was released in Britain, it was heavily edited due to their strict laws against animal cruelty.
- Originally, D.W. Griffith was supposed to direct the film. However, he quit in the middle of filming so Hal Roach and his son completed the project.
- The special effects were so good that special effect footage from this film was used in numerous other films produced well into the 1960s.
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