Corrected entry: Throughout the film, Maximus refers to his home back in Spain, and he is called "The Spaniard" in gladiatorial contests. Spain as a nation, or even as a concept, did not exist until much later. That land was known to the Romans as Iberia, and Maximus would therefore be called an Iberian, NOT a Spaniard.
Corrected entry: When the slaves have their first big fight in the Roman colosseum, Djimon Honsou's character throws a weapon to Russell Crowe, addressing him as "Maximus". However, this is before he had revealed his real name to anyone, and he was simply called "Spaniard". He doesn't reveal his name until the fight is over, and the Emperor comes out to meet him.
Corrected entry: In the battle with the Germanians, we see a Roman soldier killing a fallen opponent with the tip of his spear. This would not happen in reality. The spear is a javelin, or 'pilum', used for throwing. If the soldier still had his pilum, he would have used the reverse end of it, the 'shoe', for finishing off his foe. The shoe was a sharp metal point used to stick the spear into the ground. (00:09:35)
Corrected entry: While in his tent, Marcus Aurelius shows Maximus a sword with the inscription "MARCUS AURELIUS FECIT" (Marcus Aurelius made [this]). The Roman alphabet did not include the letter U until the Middle Ages; V was used instead. Moreover, Latin text did had neither spacing nor punctuation. Thus, the inscription should have read "MARCVSAVRELIVSFECIT". (02:06:40)
Corrected entry: In the battle against the Germanians, the Romans are using German Shepherds as attack dogs. The German Shepherd didn't exist at that time. The Romans used the Mastino-Napolitano (commonly known as the Mastiff), a much older and fiercer breed, in war and in the arena. They even provide armor and helmets for those dogs.
Corrected entry: As the scene is ending with Marcus in the dungeon chained after his recapture, the next scene starts with the crowd chanting his name. A man cheering in the crowd comes into view in the bottom right corner wearing an olive green T shirt and a big radio headset. (02:15:45)
Corrected entry: During the "Battle Of Carthage" fight in the arena when Maximum gallops past Juba on horseback, Juba shouts "Maximus!" and throws him a sword which Maximus goes to catch. But if you watch closely right at the end of the shot you can see Maximus' hand fumbles and doesn't actually manage to catch the sword - yet in the following shots he is still riding around the area, wielding the sword.
Corrected entry: In the scenes of the Colosseum the shade of the arena is wrong. There would be two types of tickets: shade or sun. One half of the Colosseum would be shade and the other sun. This is still practiced in Spain at bullfights. The shade tickets are much more expensive of course. In the movie it looks more like closer to noon than four or five o'clock.
Corrected entry: When Proximo is testing each slave, by giving them a wooden sword, they practice with a bigger slave. After each fight, Proximo says either yellow or red. The black guy who fights gets a red mark, so does Maximus, yet in the Roman Province scene in the small arena, someone says put red with yellow, yet when Maximus and the black guy come out, they are both "red". (00:49:20 - 00:52:50)
Corrected entry: At the end of the first battle sequence there is a brief "victory" shot of the Roman army celebrating. Towards the bottom of the screen you can see an obviously dressed Germanian warrior cheering alongside some Roman soldiers. Wonder what he has to be happy about, except for maybe being alive in the middle of that bunch. (00:12:00)
Corrected entry: Before one of the gladiatorial fights in the Colosseum, there are chariots with men throwing free bread to the crowd. The camera angle changes and they have moved further away from the crowd. (01:37:25)
Corrected entry: In the scene where Maximus is escaping, and he sees his friend Cicero on his horse, Cicero shouts "Maximus." as he tries to warn him. The horse is startled and runs off, but the noose around Cicero's neck pulls him and flings him backwards. As he swings backwards, he hits the tree. In the next shot, Cicero is alive. But someone that had been alive, even with a noose around their neck, would have twitched, or made some indication of trying to pull away from the tree. (02:07:45)