
Continuity mistake: When Elliot shows up the morning after Halloween her mum hugs him and gets dark paint on her cheek. When the angle changes the stain vanishes.
Suggested correction: Mary doesn't get "dark paint" on her cheek when she hugs Elliot. When Mary's standing at the fridge door speaking to the police officer, she's still wearing her Halloween dress and the mark on her right cheek is the black heart (part of her Halloween makeup), which is still on her cheek when she sits Elliott down on the kitchen seat.
Right after she hugs Elliot there's a wide angle where she says "Sorry" and her cheek is spotless. Screenshot can be submitted if necessary.