Factual error: When Hauptmann Lutz ditches the radio in the quicksand, it promptly sinks. This is at least debatable, since a radio of that era would've contained a substantial amount of buoyant wood. However, when Sgt. Pugh later throws his incriminating shirt into the quicksand, it is pulled down by a mysterious force. It certainly isn't Archimedes' Principle and looks more like a hidden string to the bottom of the tank on the sound stage.
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