- The bullet car used by the clay people is the same one used in the scenes on _Saturn in Buck Rogers (1939)_ .
- Much of the background music was originally used in Bride of Frankenstein (1935). Also, the song that played in the background during the sequence recapping the previous chapter's events was the theme for Invisible Man, The (1933).
- This was 'Jean Rodgers' 's final appearance as Dale Arden.
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