Ann Henderson-Stires, who brings Robbie some unpleasant news, was a regular on the popular Australian TV series Sons and Daughters.
The actor playing Conner's younger brother is popular fashion blogger Peter Adrian Sudarso, played on Nickelodeon's Power Rangers Ninja Steel.
Much of the filming was done in an actual wildlife preserve. There the actors and crew faced tepid heat, incessant insects - and no bathrooms.
A real gun and its exact replica were interchanged for the last act of the film.
Actors Minsoo Lee, from Korea, and Toru Uchikado, from Japan, each mix their native languages with English during the film.