Dyeing for Your Art: The movie is a gigantic parade of special effects. The monsters, the blood, the surreal colors, none of it is real. But the ludicrously chiseled bodies of the Spartans? Quite authentic. The actors playing the Spartans, as well as the stunt crew, went through Training from Hell in order to earn those abs the hard way. For a sense of solidarity with his actors and to "feel like a Spartan" himself, director Zack Snyder did too.
Genius Bonus: Leonidas calling the Athenians "boy lovers" isn't an insult on their homosexuality. Athens prohibits over-aged prostitutes. Leonidas was saying Athenians are a bunch of wimps for not having sex with "real" men.
Fake Nationality: There is not a single Greek or Iranian actor in a film about a battle between Greeks and Iranians. Mocked mercilessly by the Rifftrax dub:
Leonidas: Och, give the Persian messenger some haggis and tell him I'll be right there!