Visible crew/equipment: When they are performing the exorcism at the end, there is often a white marker by the rear right (viewer left) chair leg.
Visible crew/equipment: When Cindy has her mom play the music box to see Rory, at the end the little girl jumps at her mother to scare her and jostles the camera. (00:00:25)
Answer: It is explained in The Conjuring 2 that Lorraine has a premonition of Ed being impaled.