Factual error: Julie mentions the time when someone saw the Virgin Mary on their toast. However, the famous piece of toast happened in 1994, six years after the events of this movie take place.
Plot hole: At the end of this movie, (1988) Kristi and Katie's mother died. In the first Paranormal Activity (2006), when the psychic is visiting he says it feeds off negative energy, and Micha says "I guess we can't have your mother over anymore."