Visible crew/equipment: As the house is crumbling in on itself in one of the last scenes, there are a couple of shots of the ceiling being pushed in by some 'unseen force'. If you look closely as the last bit is falling, you can catch a glimpse of a hand and black sleeve pushing it in.
Visible crew/equipment: When Mrs. Collins is talking to Sue and Tommy, Norma enters the room with attendance sheets. As she leaves you can see the boom mike pole and boom reflected in the glass of the door. (00:38:25)
Visible crew/equipment: When Carrie is waiting for Tommy to pick her up, a white "T" mark is visible on the road where Tommy's car is to stop. (00:53:55)
Answer: He starts to genuinely like her, hence his disgusted reaction at the sick practical joke played on her.
Manky