Trivia: Rick Rosenthal, the director of the film, makes a cameo as a professor.
Trivia: Throughout the entire film the screams you hear from the girls in the house are exactly identical.
Trivia: The professor in the University at the beginning is named Dr. Mixter just like the doctor who gets a syringe stabbed through his eye in Halloween 2.
Trivia: In Laurie's room at the hospital, you can see a crumpled up picture of Josh Hartnet who played her son.
Trivia: Busta Rhymes appeared on an episode of WWE SmackDown to promote this film the day before its theatrical release. Dwayne "The Rock" Johnson asked him if he would die in the film since horror films typically kill off black characters first. Rhymes simply responded with "Hell no."
Answer: Or maybe he's thinking that his mission to kill Laurie is done. He's been trying to kill her for a long time and succeeded. No need to continue, but when those kids invaded his house, the killing began again. No one goes into his house, but him.