- Filmed at the height of the Second World War, this serial originally featured a large amount of racist dialogue. A later reissue (released on video by Goodtimes) maintains the fact the villain is Japanese, but otherwise features new narration and dialogue which substitutes less-racist terminology.
- With the success of Batman (1966), Columbia's 8mm division released this serial in a condensed version on six reels of super-8 film for the home market. The total of all six reels amounted to about one-fourth of the running time of the original serial. This release was noted for its production problems resulting in an over-exposed image with reduced contrast.
- Shortened versions of the individual chapters were released for the 8mm home movie market in the late 1960s.
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