When Lionel Atwill as Dr Xavier leads the plain clothes police detectives on a tour of his academy, he introduces them to Dr. Haynes, saying, "This is Mister Stevens and Mister O'Halloran...they're making a tour of scientific research." Haynes suddenly takes Atwill aside and says with alarm, "Why did you bring the police in here? Get them out..." Atwill however, had made no mention to him of their being policemen.
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.