The narration that begins the third act states that the murder of "Porker" Davis takes place on the evening of November 16, 1933. However, the tag placed on the morgue drawer states that the body was received on October 4, 1933.
When Ness and his Untouchables talks with Benjy on the subway train, the lighting flickers as though the train is moving, but the brick wall outside the window behind Benjy remains stationary.