Each 8-foot-tall triffid prop concealed an operator on a go-kart seat in a fan-cooled, 5-foot diameter base. The base was modelled on a ginseng root. Two of the props were later used in a carnivorous plant display at the Natural History Museum in London, England.
The title sequence, by graphics designer Douglas Burd, was shot on 35mm film and used quantized color levels in stark relief against a black background. Burd was killed during production when his self-made plane crashed during a flight.