Other mistake: In the battle at Gaugamela scene where Cleitus jumps off his horse to help Alexander in the battle, Cleitus is seen cutting the head off a barbarian and throwing it at another. Two seconds later he is seen swinging that same head back and forth.
Alexander (2004)
1 other mistake - chronological order
Directed by: Oliver Stone
Starring: Anthony Hopkins, Colin Farrell, Angelina Jolie, Val Kilmer, Jared Leto, David Bedella, Jessie Kamm
Revealing mistake: Towards the beginning of the movie, young Alexander tames a horse and then jumps on the horse and rides off. He is supposed to be riding bareback, but in one of the shots from a distance, you can tell that the actor's feet are in stirrups.
Olympias: You are everything Phillip was not. He was coarse, you are refined. He was a general, you are a king. He could not rule himself. And you shall rule the world.
Trivia: Even though Angelina Jolie plays Colin Farrell's mother in the movie, she is only a year older than Farrell.