Meg putting Peter's head on a stair, hitting it by her foot, and breaking Peter's teeth, is a nod to the iconic scene from American History X (1998).
When Meg fills the pillow sack with soda cans and attacks the other kids is a nod to Sean Penn in the film Bad Boys (1983).
WILHELM SCREAM: Heard when a helicopter flies through a pyramid of water skiers.
The title is a reference to "Dial M for Murder".