Actor Allusion: Pam Ferris plays an overweight, sadistic woman who acts incredibly cruel to an orphaned related-by-marriage child relative (her step-sister's daughter, Jenny Honey) and seems to believe that it's In the Blood when it comes to how rotten children are. Also, she is perfectly happy simply assuming how nasty children are without gaining any proof. And, really, compare these lines:
Trunchbull: The apple never rots far from the tree! Harry Potter's Aunt Marge: If there's something wrong with the bitch, there's something wrong with the pup!
Throw It In: A minor example; As Matilda prepares to go on her first day of school she wears a blue sweater, but Mara Wilson thought it was too itchy and didn't like wearing it. So for the next scene when she gets in the car Wilson took off the sweater and left it folded on her lap.