Continuity mistake: The appearance of Grace's house by the front door (to the left of the screen) changes from the time Billy is standing along the road to when he meets his mother half-way. At first, the side of the house is mostly white; it is mostly brown thereafter. The garage area to Billy's left also changes color from brown to white. (00:05:22)
Continuity mistake: A car and a truck are parked in the driveway when Billy approaches and hugs his mother, but the vehicles are not there when the camera shifts to a close-up of them hugging. (00:05:34)