Liv Collins based her accent for Kallie on a voice that her and her husband (the director) do at home together when they turn down chores.
Tony Burgess was originally supposed to play Dale when the script was written 7 years ago. His portrayal would have been more film noire esque.
An early treatment of Cult Hero was written in 2014. It was temporarily shelved and elements of this early treatment were used in The Hexecutioners (2015).