Gladiator

Somebody messed up. It seems like an editor accidentally left in a shot with the gas cannister of a chariot in plain view! This was obviously an accident since Gladiator is in the time period of 180 AD. Obviously, they used horses to power their charitors, not gas. Whoops! 

Malcolm X

Malcolm X was an activist and leader from the Black liberation movement of the '60s. He was so influential that Hollywood decided to make a movie about him and his journey. Most of the film was historically accurate, except for one scene. As his home was getting firebombed, Malcolm shouts for someone to call 911. The directors must have assumed that the service was around then, but it wasn't! 911 Emergency Services was launched in 1968, three years after Malcolm was murdered.