The school in the movie is William Dawes Elementary. William Dawes was one of the riders who, like Paul Revere, warned the minutemen that British troops were coming, just as a child at his namesake school was trying to warn people what was coming.
The perceptual phenomenon of people looking for patterns in randomness (number strings, faces in trees, shapes in clouds etc.) is called Apophenia.
The predicament of being able to see future disaster and fearing no one will believe you is called "The Cassandra Complex", after a Greek myth.
Film debut of Liam Hemsworth and Lesley Anne Mitchell. The latter retired from acting after just this one film and the show Galera do Surf (2005) to become a teacher.