* FakeNationality: Frankenstein, despite being repeatedly described as [[WhiteLikeMe Caucasian]], is played by Japanese actors Koji Furuhata(adult) and Sumio Nakao(child).
* WhatCouldHaveBeen: Before this film came to be, Creator/{{Toho}} had attempted at least two earlier movies with the Frankenstein Monster:
** The first would have pit him against ''The Human Vapor'', a character from an earlier Toho scifi film. The production never got very far past the initial draft stage.
** The second attempt (from which some elements would be used for this film), would have pit him against Franchise/{{Godzilla}}. Toho planned on making the film as a follow up to ''Film/KingKongVsGodzilla'' (though a script was actually writen before that particular film was made, with Godzilla awakening [[Film/GodzillaRaidsAgain from that iceberg he was trapped in]]). The script was dropped all together due to some very confusing plot points. Most infamously, the fact that the JSDF would have crossed the GodzillaThreshold by ''freeing Godzilla from said iceberg themselves'' to kill Frankenstein because they are afraid Frankenstein will start eating humans. The idea of Godzilla being released in the hopes of using him against other monsters would later be reused for Film/GodzillaFinalWars.