Spotless Vehicles
I know life was lived at a slower pace back then but, like all period dramas, it seems that the owners of motor vehicles in 'days of old' washed their cars/trucks/whatevers every five minutes. This is not a criticism aimed at this series in particular. It is something I've noticed in many series ranging from England's 'Poirot' and 'Miss Marple' to many U.S. films and T.V. shows.
A quick glance at any film from the early 20th century will easily confirm that most vehicles had at the very least a covering film of dirt. Shiny *beep* and span' vehicles were a rare exception; especially considering that most roads at the time were not sealed.
I wonder what the reaction of period vehicle owners would be to a casting notice for "1920's Australian vehicles, must be in working order and be able to be driven through muddy creeks and stony gravel. A few dents and obvious signs of wear preferable".
That wasn't very sporting, using real bullets.