When Annie goes in the church and sees pictures of her mother on the wall there's a picture that says it was in 1989 but the kid in the black shirt is wearing a DCSHOES hat. That company wasn't founded until 1993.
When Annie is using the Ouija board she takes the cross off her neck and removes the chain before putting the cross on the floor. When she asks the first question the cross is attached to the chain again.
At the beginning of the movie, when Annie first stays over at her mom's house. She picks up a fallen jar of pickles in the kitchen, at the first shot you can see her putting the lid back on the jar, but in the second shot the lid is of the jar en she puts it next to the jar on the counter.
When Annie wakes up in the closet with her hair tied to the pipe, she reaches up and grabs a wire clothes hanger to use as a weapon. She bends it in half with the top still curved in a circular shape. (Not a very effective weapon at that point) She then stabs Charles/Judas with it in the side, and when he pulls it out of his body the clothes hanger is in a totally different shape, the curved part is gone and now it's a dangerous looking point, with the curved part gone.
When Annie is on the internet scrolling down a page of known serial killers, one of the serial killers is listed as "Bruce Oliver". However, the picture above the name is actually of serial killer Dennis Rader, the "BTK" killer.