In the big Chariot Race, one guy falls out of his chariot and is run over by the next. The guy is carried off the scene by two or three other men. This man was actually dead. What happened is this. When shooting this scene, the plan was for the man to position himself so that the horses would run around him. The chariot was built so that when he laid down, it would go right over top of him. During the shooting, the man panicked and tried to rise up. The chariot caught his forehead and killed him. If you watch the scene in slow motion, you will notice the unusual angle of the body as it is flipped by the chariot and rolled.