The first "Best Picture" Oscar winner of the 21st century can't possibly have a big, glaring mistake in it, right? Wrong. He is Maximus Decimus Meridius, father to a murdered son, husband to a murdered wife. And he will have his revenge for this blooper in this life or the next.
During the epic fight scene in the coliseum, a chariot is knocked over and spills out onto the floor, clearly exposing a gas canister which is being used to propel it (they didn't really use the horses for that whilst making the movie. Sorry to spoil the magic). We're pretty sure we don't need to point out that this kind of technology was several centuries out from the era they movie was set in. Maybe we've all misunderstood "Gladiator" for all these years, and it's actually the greatest steam-punk movie ever made?