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.
Edmund Pegge was first offered the cameo role of Walter but was not free . So another actor was cast but at 48 hours notice Pegge was hired because the replacement actor had been fired.