Deliberate "mistake": When "Henry Faber" discovers the phony airfield, several helicopters with Army markings are among the aircraft visible. Although the Army did use helicopters experimentally during WWII, those used bore no resemblance to those shown in the film.
Visible crew/equipment: After Faber has hitched a ride (when his motorcycle failed,) the driver pulls over to let him out. As the car pulls away from Faber you can see a crew member in a blue vest type coat reflected in the passing car window.
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