One of Madeline Hatter's (Maddie) lines is a reference to Monster High.
WILHELM SCREAM: When Apple White takes a bite of the poisoned apple afterwards she yelps the Wilhelm scream.
WILHELM SCREAM: When Daring Charming fails to wake up Apple White he yells "NNNNNNNNNNNNNOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!" then yelps the Wilhelm scream.