Continuity mistake: In the bowling alley, 'Pal' comes over to speak to Tia. During their conversation, the camera pans to Maisie throwing a bowling ball; however Tia is now sitting alone. Pal has disappeared. (00:40:10)
Continuity mistake: The scene where the elementary school teacher asks his kid what they did that week. After he asks that question and Maizy raises her hand, look at the desk belonging to the girl in the row next to Maizy. It has crayons and other supplies on it. After the teacher calls Maizy's name, the shot goes back to her, showing the girl in the next row's desk completely empty. (00:58:00)
Answer: You can't actually see a person, all you see is a human-sized lump under the covers. It's possible that it's just bunched-up blankets, some pillows, or even clothes.
So, I just noticed this in the movie. If you go at about 10 minutes and 21 seconds, you'll see the blankets move behind them real fast while he's on the phone.