When the boy cooks the fish atop a piece of wood held over the fire, it's clearly raw, as one would expect it to be. One cannot could flesh atop a piece of wood, unless the wood itself is on fire.
Niamh finds cereal boxes in a kitchen cupboard when scavenging for food, but they're empty, yet neither homeowner nor other scavengers would return empty cereal boxes to the cupboard.
The license plates of the car Niamh and the boy take, are intentionally blurred.
When Niamh jumps into the field to escape the yellow car, the car passes her on the highway before backing up. He makes no effort to pursue her.