Witnesses was the last production to film at the Firestone Tire factory in South Gate, Los Angeles - the same location for the Netflix film "Bright," starring Will Smith and Joel Edgerton, the TV series "SWAT," and the "This Is America" music video by Childish Gambino.
There are many nods to Stanley Kubrick's, The Shining, throughout the film including a picture of Wendy Torrance (Shelley Duvall) on Steve's bedside table, a clock reading 2:37 in the study lounge, and a scene with a green bathroom.
A abstract art picture of Verdugo's mask hangs in Steve and Luke's dorm room.