Corrected entry: During the dinner scene where Octavian confronts his family and Marc Anthony about their various infidelities, he refers to Agrippa as "a low born Pleb". This is done to amplify the disgrace to Marc Anthony of his wife having an affair with Agrippa. But the real Agrippa definitely was not a Pleb but a member of the Equestrians, the second tier of Roman aristocracy. This can be easily confused as in 43AD Agrippa became Tribute of the Plebs. But this office was open to both Plebs and Equestrians by this time, but not Patricians such as Octavian. Given Octavian's thoroughness, it is hard to believe this is a character mistake.Marcus Scott
Corrected entry: It is made out in Series 2 as if Livia is Octavian's first wife. In fact she was his third wife. In reality his marriages to his two previous wives only lasted 2 years in total so historically they were much less relevant than Livia, the mother of Tiberius, the next Emperor.Marcus Scott
Corrected entry: At the time the series is set the height of the average Roman foot soldier is estimated by historians to be about 5 feet 4 inches. A big chap like Pullo would have looked like he was surrounded by Hobbits in battle. The Celtic peoples that the Romans fought tended to be significantly taller due to a better diet than Mediterranean people. The small battle shown in the first episode is therefore not strictly accurate. As more Central and Northern Europeans were recruited by the Romans the average height of the army rose. Excess character height tends to be a mistake in all historical dramas and would be extremely difficult for the directors to correct.Marcus Scott
Corrected entry: Quintus Pompey introduces himself as Quintus Valerius Pompey. If he is the son of Gnaeus Pompey, then his name would be simply Quintus Pompey, not Quintus Valerius Pompey. Adding the name 'Valerius' makes him a member of the gens Valeria, i.e. an entirely different family.
Corrected entry: There was no Roman named Marc Anthony, the man who was a friend of Caesars and later husband of Cleopatra was named Marcus Antonius. If they called him Marc Anthony at all times in the series that wouldn't be a mistake, since it would be "modernized" language, but in this episode they at one point refer to him as Marcus Antonius. If they acknowledge that this is his name it is an error for them to call him Marc Anthony in other scenes because it makes no sense.