Corrected entry: At the start of the "Battle of Carthage", a man shouts: "Far away, in Zarma." Zarma is not the name for the land. It's Zama.
Corrected entry: Although many like to quote it, few have apparently read "Decline and Fall of the Roman Empire" by British historian Edward Gibbons. For it clearly describes a Roman general named Maximus Quintillian. He may or may not be the person portrayed in the movie, but there was a Roman general named Maximus who defeated the Germanians and was a favourite of Marcus Aurelius. He was killed by Commodus.
Correction: Actually, if you watch the documentary on the VHS called 'Blood, Sand and Celuloid', it clearly states that Maximus was the only fictitious character in the film. If you read 'The Decline and Fall of the Roman Empire' and other related texts properly, it is quite clear that Maximus Quintillian was a favourite of Marcus Antonius Aurelius, not Marcus Aurelius. It is true that Quintillian was killed by Marcus Antonius Aurelius' son, but he was called Antonius Commodus. As such, this was an entirely different father and son, though the names are similar. There is no record of a general called Maximus at the time of the early Aurelians, the time of Marcus Aurelius and Commodus.
Do you mean Marcus Aurelius Antoninus? The Gibbons reference about Maximus Quintilian doesn't say anything about him being a general.
There are about 14 Emperors named Marcus Aurelius. Including Commodus, being of that line.The First Marcus Aurelius full title was Caesar Marcus Aurelius Antoninus Augustus. Commonly refered to as Marcus Aurelius. There is only one the first and that was the one portrayed in the movie. Commodus became Emperor Caesar Marcus Aurelius Commodus Antoninus Augustus. Also portrayed in the movie.
Corrected entry: One of the senators claim that "Rome was founded as a Republic". This is wrong, Rome was founded as a Monarchy.
Correction: This isn't really a "mistake". The senator is a republican, and Rome had been a republic. Modern politicians come out with self-serving distortions of history all the time. There is no reason to suppose Roman politicians were any different.
Correction: The long a (ar) as opposed to the short a (ah) is entirely due to the speaker's accent. Unless he is carrying around a sign with the name misspelled, this is not a film mistake.