Inhaler Mistake
In the scene right before the kids go into the grave to get "IT", they all take a hit of the inhaler. When it's the girl's turn, she inhales but she forgot to hit the button.
Deja Vu?
They were all in the library. Mike was phoning Stan on the phone. Beverly was sitting on the table until she heard Stan was dead, then she got up. When they went back to her after looking at every one else, she got up again.
