Intended as the first part of a trilogy.
Plans are now that this film will be remade and be followed by two sequels.
Originally there was a scene after The Boy's death where a friend walks in the house and discovers him dead. The Friend then tries to run out the door, but is also killed. This scene was accidentally deleted from the film.
Another accidentally deleted scene featured two neighbors ringing The Boy's doorbell asking if he could make the party. In which he says he cannot, because he is home alone and has to watch the house.