Serious flaw

Why, for example, establish that the kids can tap into a phone line, if later in the movie they don't use that skill to communicate to the U.S. troops surrounding the school? The movie is so absent-minded that even the kid who's the ringleader forgets about the phone gimmick, and goes to great trouble to sneak out of the grounds through a forgotten drain pipe, in order to give information he could simply have phoned in.

Wow... Ebert is a moron, or he wasn't paying attention, but since his career is writing reviews, not paying attention is also moronic. Ebert = Moron confirmed no matter how you slice it.

Ebert was a great reviewer but he could be total bellend on occasion. Remember his view of Die Hard..?

Of course, the biggest actual flaw of this story is the notion that teenagers would care enough about their school to want to try to save it at all, LOL!

No, I disagree as many have pointed out here. It's not a flaw - it does, in fact - demonstrate Billy's problem solving and the movie makes sure you see the one terrorist cut the phone lines. I am surprised that Roger Ebert missed that.