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While this might be coincidental, the use of a pocket watch to hold Hitler's soul is reminiscent of the way Time Lords' essences can be stored in pocket watches on the TV show [https://en.wikipedia.org/wiki/Doctor_Who Doctor Who], first shown in the two-part story [https://en.wikipedia.org/wiki/Human_Nature_(Doctor_Who) Human Nature]/[https://en.wikipedia.org/wiki/The_Family_of_Blood The Family of Blood], in which The Doctor stores his Time Lord essence in his fob watch and becomes human. This is reused, most noticeably, in the episode [https://en.wikipedia.org/wiki/Utopia_(Doctor_Who) Utopia], in which The Master regains his Time Lord essence from an old fob watch.