Continuity mistake: When Leonidas, and presumably all the other Spartans, use their spears to clear their shields of arrows after the arrow shower from Persian archers, the tips of the arrows are still visibly left on all their shields. In the next shot, when the Spartans regroup for the Persian cavalry charge, the arrow tips are gone. (Granted, this is a highly stylized movie based on a comic book, but that does not change the fact that this is a continuity error.)
Revealing mistake: In the first major battle between the 300 Spartans and the Persians, Leonidas is slaughtering the Persians and the speed of the scene goes from slow motion to fast motion, you see very realistic CGI blood. When the blood hits the the ground it suddenly disappears. This happens many times during this long and awesome scene.
Trivia: Remarkably, there was nothing CGI about the incredibly fit Spartan soldiers. All the actors went through an extremely rigorous bodybuilding regimen to achieve the desired image in the movie. The workout, now known as the 300 workout, is available from numerous sites all over the internet. Caution: it's not for the faint of heart.
Persian: A thousand nations of the Persian empire descend upon you. Our arrows will blot out the sun!
Stelios: Then we will fight in the shade.
Question: Could someone please explain the goat in Xerxes' 'sex room' (for lack of a better word). The scene before Xerxes offers the hunchback Ephialtes everything, this scene begins with a shot of a goat with human hands playing an instrument and (I believe) smoking something. Does Xerxes have a goat fetish or something? Could someone kindly explain this for me.