(at around 23 mins) The victim has allegedly shot himself in the abdomen with a shotgun - obviously at close contact. However, the gun barrel in the close shot is spanking clean.
When Lindsay is attacked by Betty Willens, the foot mats Danny carefully placed as they entered the house, are gone.
Lindsey identifies the thuja occidentalis (eastern white cedar) as pinus strobus (eastern white pine).
The opening segment when Lindsey and Danny show up at the house in Amityville explains why they were able to investigate in another jurisdiction. The officer on scene explained he had requested them because all of his units were working a Cessna crash. Police can cross jurisdictions when they are requested.