Blood and fur disappears from the front of the car shortly after Peter examines and fixes headlight.
The windshield of Peter and Carla's vehicle is hit by at least one flying bird, which leaves the glass smashed. Yet in some later scenes, the windshield is undamaged.
They say they are going to the North Coast, we presume Victoria, as they start in Melbourne. But they pass a sign "last fuel before Tathra", which is on the NSW South Coast.
Victoria doesn't have a north coast. It only has a southern coastline which can be described as east or west of Melbourne.
Dugongs are a tropical species. They are not found in Victorian waters which are nearly 2000 kms to the south and much colder.
Peter swaps between right and left hand shooting of the rifle. He may be ambidextrous but humans have a dominant eye and normally aim with that eye.