Corrected entry: In the scene in the beginning of the film, Marcus Araelius is in his tent working on a document. The writing utensil he's using looks suspiciously like a number two pencil. This is seen again just after the Battle of Carthage; Commodus repeats the scene, working on some document with, obviously, a number two pencil.
Corrected entry: In one of the first scenes of the movie, when Maximus is first taken from his room to be executed, all of the guards grab him and he begins to struggle. If you watch behind him, a guard raises his sword (unsheathed) and apparently strikes him in the back of the head. A strike like that should have killed Maximus, or at least left some sort of gash in the back of his head, yet when we see him later, there is no mark.
Corrected entry: In the restaurants outside the Colosseum you see glass bottles on the table and the senators drinking from glasses. But glass was much too expensive in that time to be used in such ordinary restaurants. (01:02:50)
Corrected entry: The throne on which Commodus sits at his palace looks like an 18th century "Empire" style chair typical of Napoleon's period, (I believe the Romans used marble thrones with cushions). Also it is situated in front of an opening that looks like a balcony. Not considering the fact that the Emperor could catch his death of cold, it would have been extremely easy to murder him. Also where was his Praetorian Guard (the only army allowed in the city of Roman who acted as the Emperor's bodyguards) when he moved in the Palace?
Corrected entry: The use of cavalry in the opening battle is wildly inaccurate, and not reflective of Roman cavalry practice.
Corrected entry: After the battle with the Germanians Marcus Aurelius says to Maximus, "You have proved your valor, yet again Maximus." The camera then shows Maximus turning around to face him. Then it shows Marcus Aurelius again and if you look to the right (his left), behind him is a horse on the ground. The horse gets up and tries to walk away, but can't because his back right foot has a rope around it, that is tied to the ground to keep the horse in place. (00:15:05)
Corrected entry: In the scene when Maximus and Juba are fighting (tied together with a chain) against other gladiators, they kill the last one and win the contest. Hagen was also fighting and is alive later in the movie. But when the camera is turning around to show Maximus and Juba with the arena and the spectators in the background, Hagen is not there. (00:55:55)
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: During every Colosseum fighting scene, the senators are all wearing white togas. They would have only worn them during election time, not to attend the games in.
Corrected entry: In the scene where the four Praetorians are taking Maximus out in the woods to execute him, the swords don't add up. Maximus grabs the first Praetorian's sword and kills him with it. Then the other one tries to take his own sword, but the frost makes it stick to the blade and then he is killed. Maximus yells for the third, and when he comes closer, Maximus throws his sword at him, so he dies. He yells for the fourth and last Praetorian, and suddenly he has a sword in his hand - where did it come from? The only available sword was stuck in the scabbard by frost.
Corrected entry: At the time of the movie the name "Colosseum" would not have been used. It's original and correct title is the Flavian Amphitheatre. Colosseum is a nickname given to it in the 9th century by an English explorer because of the colossal bronze statue of Nero as the sun god which used to stand next to it.