Errors in geography: In the opening scene of the film, Lee Tracy is shown strolling along the New York docks in search of news, when a body arrives at the Mott Street Morgue across the street. In reality, Mott Street, located in New York's old Chinatown district, is fairly well landlocked and nowhere near the either waterfront or dock areas.
Revealing mistakes: As Dr. Xavier displays the wax figures of the murder victims, on the first figure, that of the "woman of the streets", the left hand can be seen trembling slightly.