The car which takes Griffin to the shooting location changes color from black to silver and back. You can see this when they stop on the highway,and Griffin gets back in the car and closes the door the side of the car is silver. Also, the mirror of the car is silver when it should be black.
In the scene where Alistair (as a teenager) is rummaging through the box under his bed, he extracts a knitted stuffed animal and places it beside the box with the head facing away from him. When he pulls out the gun, the stuffed animal is now lying with its head closest to him.
When Joe and Vika are smoking on the balcony, the scene cuts to show Alistair arriving. The camera shows the house from the front, and the balcony where Joe and Vika are smoking is visible, but they are not there, nor is Alistair's car shown coming up the driveway.