While planning out the dimensions of the set, Ben Wheatley built a scale replica of the film's warehouse in the video game Minecraft.
Wheatley described games such as Counter Strike as a source of inspiration for the film. He also built the set for the film originally on Minecraft.
Armie Hammer said that police appeared on set during the second day of shooting following calls of concern from members of the public in nearby shops having heard gun shots.
Luke Evans was cast as Vernon but dropped out due to schedule conflicts with Beauty and the Beast (2017). The role was reworked for Sharlto Copley when he was cast.
Sara Dee features in Free Fire and all previous Ben Wheatley movies he's directed for cinema release. She plays the telephone voice.
Brie Larson and Michael Smiley have both worked with Edgar Wright; he directed Larson in Scott Pilgrim Vs The World and he directed Smiley In Spaced and The World's End.
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