Line Producer Stephen A. Marinaccio II mentions in the DVD Director's Commentary that the parked school bus behind the kids at 49:05 was strategically positioned to conceal the crew tents, a service area, and a playground (which students of the school used year-round).
So you're not scared at all?
Billy Kirkfield: Of stepping on dead people? No.
Howard Garvey: No, of what's gonna happen to you when you die.
Billy Kirkfield: Well, what's that supposed to mean? I'm definitely going to Heaven. My parents make me go to church and everything.
Lucas Lamb: That doesn't mean you get to...
At about 37:50 min into movie, when Billy is in lunchroom speaking to kids, there are 6 flags hanging on the wall in the back ground. They are the Azerbaijan, Andorra, American Samoa, Rwanda, South Vietnam & Botswana world flags. They are suppose to hang down when you turn them to the right it will show the correct way the flag is right side up. Except for the American Samoa Flag, the one with the eagle on it. When it turns to the right it would show the flag upside down.
$54,333 23 October 2011