Alex was buried in an area at the top of the cliff yet when she crawls out of it, she comes across Jamie's body who had fallen off and landed 200 feet below.
Alex somehow went from being a brown-skinned, brown-haired child to a white-skinned, blonde adult.
The pattern on the broken windshield changes from two smaller ones when they hit the kangaroo to one large one when they arrive at the house.
The cop shoots Alex in the head from behind and the bullet is shown sticking out of her forehead just enough for her to be able to pull it out herself before collapsing. So much is wrong with this. A bullet exit wound is huge, not a tiny hole. If the bullet had slowed down that much to just poke out a half inch, it wouldn't have been able to penetrate the skull on the way out. Also Alex would've died instantly from a shot like that, not had time to make a dramatic scene about it.
Vehicles drive on the left-hand side in Australia. Directly after an injured kangaroo is euthanised, an overhead shot shows a red car travelling on the leftmost lane going from the top of the frame down. It is driving on what would be the car's right-hand side of the road.
The cottage is located in a remote area of the woods yet the police show up within 2 minutes of Emma calling them.