Hope says during their conversation about the demon that there needs to be performed an exorcism in order for the demon to be banished from the realm, merely killing the host wouldn't do a lot. Then near the end when someone is possessed by the demon, she is yelling that they must be killed.
During one of the scenes - just before the meeting with friends, when Angie goes upstairs - in the kitchen on the plate is something that looks exactly like a finger of the demon.
When Angie is in the kitchen cooking, she wants to grab the knife NEXT to the cutting board (where she left it) but it's not there. Then she hears a noise and when she runs back into the kitchen to grab a knife to protect herself; the knife is in the middle of the cutting board.
When Angie is dealing 911, the phone makes three different tones as the presses the buttons, when there should only be two, since she would have pressed the '1' twice, and it would have had the same time both times.
When Angie is dialing 911, as she presses the buttons, there are three different tones. There should only be two, since pressing the '1' button twice would result in the same sound both times.