In the scene where Kozlowski is first arrested, the exterior shots with the police officers at the house clearly show the number address as "3410". Once inside, the officer calls for backup to "321 Spruce Avenue".
When the police officer searches the basement of the house for missing child, he shines his flashlight on some blood partially covered by a caged animal. When a second camera is used to continue the scene the blood is no longer covered, at all, by the cage.
The action is supposed to take place in Vermont. The gas station is Esso and the price posted is in liter. This is clearly shot in Canada as in Vermont, it would have been a Exxon station and a price per gallon.
Judging by the license plates and the sign behind the judge, this movie takes place in Vermont. However, the long shot right before the first court scene shows a harbor with towering high
rises behind it. The tallest building in Vermont is only 11 stories.
As Craig holds an old family photo while considering taking drugs, the picture frame has clearly been hung in "portrait" fashion (judging by the direction of the wire affixed to the back) yet the photograph itself is a landscape image.