Continuity mistake: After being chased in her house, Judy closes the door to the bedroom and proceeds to put her hands on her ears, underneath her hair. The very next shot, she still has her hands on her ears, but it is over her hair.
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.