The 300 or η μάχη των Θερμοπύλων?

Differences

To begin with, I’ll tell you the inaccuracies. First of all, Xerxes wasn’t a three metre tall transvestite. Secondly, Leonidas wasn’t a cuckold and he was also about 60 years old and had white hair and a white beard. Another wrong point is that Ephialtes wasn’t a monster but a normal soldier who betrayed the Spartans for money. The Spartans didn’t ever leave their formation, because they were always defending themselves from Persian attacks.

Similarities

Now, the similarities. The director knew history well, but sometimes he mixed the dates up. He also had some realistic points with what was going on in Sparta. He was also correct in showing us the right numbers of soldiers. The facts of all the battles were also accurate.