Just before Torrio is shot, the camera cuts to a view of the assassin in the alley walking quickly towards Torrio, with focus on the revolver in his hand. However, upon the first shot at Torrio, the gun has changed to a semi-automatic pistol.
While Chalky is in North Carolina, a diesel train and whistle are heard in the distance. Steam trains were used at that time, not diesel. This mistake was made in previous episodes as well.