Thanks for the heads up. I also watched it tonight.
It seemed to be fairly true to history, but it's impossible to say since the history of Thermopylae wasn't written down until much later. If, and this is a big if, Richard Egan, or more properly the screen writers, pronounced Molon Labe correctly, at least I now know how it sounded. And because he emphasized it, I have a feeling they had researched the pronunciation.
I don't remember the exact words, but the announcers words at the end of the movie were very appropriate for today. Something like, "This is what a few brave men can accomplish in the face of tyranny". If you have the tape, could you relate exactly what the sentence was?
Also, the host on AMC had a very compelling thought. If the Spartans had not fought so well at Thermopylae, it's possible that the Persians would have had many more victories and Western civilization would not exist as it does today. Thermopylae was compared to the importance of D-Day.
[added later]
TexasVet - You must have missed it, because they did include the scene where Xerxes messenger gave the ultimatum to lay down their arms and Leonidas responded "Molon Labe - let him come and take them."