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Continuity mistake: The tissue paper in Professor Lilloman's right hand instantly jumps to his left as he gets up out of the chair in Dr. Thorndyke's office.

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Continuity mistake: In Dr. Thorndyke's office, Dr. Montague holds a pencil in both hands in the front view of him, but the view over his right shoulder shows him holding the pencil in his right hand.

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Continuity mistake: After stabbing Thorndyke in the shower with the newspaper, Dennis drops it behind and to his left. The next shot and the newspaper is seen inside the shower tub, close to the drain as the ink runs off the paper into the drain.

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Continuity mistake: Dennis, Thorndyke, and Brophy are shown in the close up getting up together outside the elevator, but the long shot shows Dennis already standing three to four feet behind Thorndyke and Brophy as those two stand up.

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Continuity mistake: The piano player speaks into a microphone in the close up, but disappears in the long shot of him.

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Continuity mistake: When Brophy tries to remove the large rock that smashed through Thorndike's bathroom window, the toilet tank lid behind him is askew. As Brophy and Thorndike leave the bathroom, the toilet tank lid is properly seated on the tank.

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Continuity mistake: As the Killer tries to strangle Thorndike in the telephone booth, there is an up close reflection of his face in the metal faceplate of the pay phone, yet all the scenes show the Killer about two feet away from the telephone faceplate.

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Continuity mistake: When Thorndike is running to the park's storage shed to escape the pigeons dive-bombing, the back of his jacket has a set number of prominent pigeon dropping marks, yet when he enters the shed there are more markings seen, and all are smeared across the jacket.

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Trivia: The actor playing Dennis the Bellhop is Barry Levinson, future Oscar winning director.

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Revealing mistake: While Dr. Wentworth is driving his car trying to shut off the loud music on the radio, the dashboard shows that the car's gearshift indicator is not in "D" for "Drive."

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