Revealing mistakes: Dad's beer can sounds hollow and empty every time he sets it down.
Crew or equipment visible: When Fenton brought the FBI agent to the rose garden, a man's shadow can be seen in the dark near where the car was parked.
Continuity: At the beginning of the burial of Edward March ("Demon #2"), Dad puffs a cigarette that is burned down to the filter. The following frames show the cigarette in his hand is much longer. There is not enough time in between the two frames to light another.