According to director Ralph Senensky, Gene Roddenberry revised the shooting script as the episode was being filmed , included in his revision was a line indicating that the inhabitants of 892-IV were too called "Human". In this instance the line spoken by Flavius Maximus, "I don't mind fighting, but why you?" was originally written as, "Why you? I don't mind killing humans, but...".
According to the novel The Poisoned Chalice, the "Magna Romanii" are Humans transplanted from Earth by the Preservers. They are members of the Federation in the late 24th century.