Julie Benz (The Wife) previously woke up in a room full of strangers and had to decide who lived and who died in Saw V.
Circle was filmed in Los Angeles in just over 10 days, shooting at the unusually fast rate of 11-13 pages a day.
The script of Circle was inspired by 12 Angry Men and coincidentally, The Cop seems to be heavily inspired by Juror 10.
All of the scenes were storyboarded prior to shooting, and the directors tried to be as prepared as possible; regardless, they still encountered problems, as all actors had to be available for every shoot. Michael Nardelli said that the psychological extremes experienced by the cast made it difficult to wind down after shooting.
Was filmed in one location over ten days (except for the outdoor ending) and almost all of it was shot in order, with the exception of pick up coverage shots.