Revealing: 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.

Continuity: 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.

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.

Factual error: Contrary to what's depicted in the movie, Cleitus was never involved in the murder of Parmenion. He was in fact on his way to Alexander when Parmenion was killed.

Factual error: Just before old Ptolemy starts telling his story of Alexander, at the very beginning of the movie, we see a shot of the famous Lighthouse of Alexandria. It's fully operational, which is a mistake because the building was finished during the reign of Ptolemy's son, Ptolemy II Philadelphos, some years after the first Ptolemy's death.

Continuity: Towards the beginning of the movie, young Alexander is receiving a wrestling lesson and his hair is extremely blonde. A short time later, young Alexander is outside with his teacher and fellow students and his hair is more brownish-blonde.