Some of it was filmed in Jackson on La 68 north of La 10 in a big field. The built at town out in the rolling hills. I have a few friends that passed it on their way to work everyday.
Here's an interview with the director that is very interesting. If you've never seen the original version, Kurosawa's Seven Samurai, it should go on your must see movie list, if you can find it anywhere to watch.