Thompson staged every scene with attention to detail, such as highlighting the conflicts with color: the humans wear black and other muted colors, while the apes' suits are colorful. Don Murray suggested to Thompson his wardrobe with a black turtleneck sweater, and rehearsed his scenes after translating his dialogue into German "to get this kind of severe feeling of the Nazis". Screenwriter Paul Dehn wrote the film incorporating references to the racial conflicts in North America during the early 1970s, and Thompson further highlighted by shooting some scenes in a manner similar to a news broadcast. The primary location was Century City, Los Angeles, that had previously been part of the 20th Century Fox backlot and translated well the bleak future with monochromatic buildings in a sterile ultramodern style. Also used as a shooting location was the University of California, Irvine, in Orange County. In addition, TV producer Irwin Allen contributed props and clothes to the film: he let the makers of 'Conquest' borrow his Seaview jumpsuits from "Voyage to the Bottom of the Sea", brown clothes and computers and cabinets for Ape Management that were used first on "The Time Tunnel" and other sets and props from other Allen productions.