Deliberate mistake: When Alexander is giving his pre-battle speech at Gaugamela, some of the shots are 'flipped', which has the odd effect of suddenly making all of the phalanx pikemen left-handed.
Alexander (2004)
1 deliberate mistake
Directed by: Oliver Stone
Starring: Anthony Hopkins, Colin Farrell, Angelina Jolie, Val Kilmer, Jared Leto, David Bedella, Jessie Kamm
Factual error: The backdrop to the party scene in India shows a large building with glass windows. The Romans were the first to use glass windows some 300 years later.
Horse Seller: My noble king, it is a high spirited animal. High spirited and worthy of Philip of Macedon, for three and a half talents. I couldn't possibly make a bigger profit of it, but for you.
Philip: Why would I want such a beast? I already have a wife.
Trivia: Even though Angelina Jolie plays Colin Farrell's mother in the movie, she is only a year older than Farrell.