Australia has no Panthers. There is an urban legend stating that a panther escaped from a travelling circus, and fled into the woods.
There have been several sightings and even a footprint found, but no concrete evidence of a panther has ever been found.
It was such a cold shoot that half the cast wore wetsuits underneath their costumes.
For the scene where the panther enters the barn, there was of course no panther as it was a CGI creation. Instead director Patrick Hughes got down on his hands and knees to give Ryan Kwanten something to react to.
Tommy Lewis shot to fame over 30 years earlier in Fred Schepisi's The Chant of Jimmie Blacksmith (1978). His character here is essentially a continuation of Jimmie Blacksmith. His character in the movie is actually called Jimmy - it has a slightly different spelling.
The production company didn't have access to a rain machine, so the local fire brigade, the Country Fire Association of Victoria, was paid in beer to hold a hose over a scene being filmed, so as to replicate raining.