Molly's house has gaps between the slabs that form the walls. Given the location in the high country, this would make for very uncomfortable living. Gaps between slabs were usually filled with mud/ clay and the internal walls were covered with animal hides, hessian or canvas.
Molly's house is located on a high ridge, as is Sergeant Klintoff's. These houses would suffer from exposure to weather conditions given that they are not protected from high winds nor sheltered from the sun. Houses would be more likely found off high points, sheltered down amongst trees. Also, the houses would be located closer to a water source - a creek or a river - as they do not have water storage nearby (tanks, dam). A creek is seen near Molly's, but the distance and the gradient from the creek to the house would make transporting water a struggle every day.
Executions in NSW during the 19th Century were not carried out in remote rural areas and were certainly not by hanging a person from a tree. Executions were carried at Sydney and larger rural towns (e.g. Bathurst, Albury, Mudgee), Most executions were carried out inside a gaol by prison staff, not by police.
In this era, the police station would have a house attached or on a block next door. The Sergeant would be expected to live in this house, but Sergeant Klintoff lives outside town. There would also be a police paddock (and stables) where the police horses were kept nearby.
Twice in the film the term "fix" some food is used. This was never used by British/Australian settlers. Odd that the scriptwriters lapsed into American-style western dialogue.
The impression is given that the township has been there for some time - several buildings, police station - but there are no well-worn roads. Most of the buildings are separated by grassy areas, showing that this is a film set.
Molly should have some means of feeding the family whilst her husband was away droving. There is no sign of any food source at her house e.g. a vegetable garden, an orchard, a house cow, chickens, goats, sheep.
When Molly and Danny flee the Johnson house, they take only the bare necessities. Given that they were planning to collect the other children, they should have taken food, water, clothing, etc. for them.
When Molly is telling her story to Louisa, she says that her mother was a Ngarigo woman. Louisa, being a newcomer, is unlikely to be familiar with the term but she keeps writing without asking for it to be spelled for her.