"You EVIL!!" House Boy John brings something special to a gun fight.
"Killers at Play" was shot in 23 days, from January 13 through February 5 (2014). The winter days allowed the production to shoot day-for-night outdoor scenes when the sun was completely blocked by the Sierra Nevada mountain range at around 3 o'clock in the afternoon.
In November 2013, during the final development phase, the producers set the goal of creating a women-centric story-- woman protagonist, women villains, strong women supporting cast. There were male characters as well, but even before the women's movement to call out Hollywood for not promoting women stories, "Killers at Play" was already full ahead in that department, that a women-centric story can be both entertaining and intellectually and socially relevant.
On May 7, 2013, the original title on the nondisclosure agreement was "Submission." It was finally changed to "Killers at Play" in 2014.