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* BreakoutCharacter: Otto Wernicke's Kommissar Lohmann was so popular with viewers that Lang brought him back for ''Film/DasTestamentDesDoktorMabuse'' one year later.
* FridgeHorror: Considering what mental hospitals were like in the 1930s, [[MercyKill the death penalty might be kinder for poor Hans]]. He's pretty screwed either way.
** Worse still, remember that the Nazis only assumed power two years after this film was released. How do you think they are going to treat a mentally-ill Jew?
* MisaimedFandom: The ''[[ThoseWackyNazis Nazis]]''. They even took Hans speech at the end to "prove" that Jews were all evil. Because Peter Lorre was Jewish, and he played a SerialKiller, [[HitlerAteSugar that means that all Jews are serial killers, right?]] It's doubly ironic from the lawyer's equally-impassioned speech in which he states, "No one has the right to kill a man who is incapable of responsibility for his actions! Not even the state!"
** EveryoneIsJesusInPurgatory: Very much like in Lang's [[{{Metropolis}} other famous work]], the Nazis were ''completely oblivious'' the blatant TakeThat made against them in the film - ''or'', for that matter, the film's intentionally GreyAndGrayMorality. Joseph Goebbels, who was directly ''mocked'' in the movie as [[NoCelebritiesWereHarmed der Schränker]], said that it was "fabulous! Against this 'humanitarianism' tripe. For the death sentence!" It took them the emigration of Lang to finally see the movie for what it was.
*** May have been helped by the fact that, [[Film/{{Metropolis}} once again]], [[ANaziByAnyOtherName Thea von Harbou]] co-wrote the script.
* MoralEventHorizon: Subverted, in that you'd ''expect'' the act of murdering little girls to automatically lose the audience's sympathy, and yet...
* TheWoobie: Only Peter Lorre could make a child killer into a Woobie.

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