1: Many injuries should be caused by ghosts, sometimes scratches. Ghosts can manipulate objects.
Boys all know that the hero is a ghost. So at first I refused to talk to the hero. I think boys are afraid of ghosts.
3: I think one time it was grandma, and the other time it was probably for us. It was a ghost, not a little boy, who opened the cupboard.
4: Ghosts can manipulate objects.
There is a saying in the movie that ghosts can see what they want to see, because the hero never thinks he is dead. As far as he can remember, there is no cabinet in front of the crystal house, but there is, so he can't open it. I don't know. Maybe the cupboard is not always in front of the door.
6. This device can sometimes record the sound or image of the spiritual world. It is said in the film that ghosts can see what they want to see, push logically and hear what they want to hear.
7: It only represents my personal opinion. Please forgive me if there are any mistakes. Thank you!