Randy Cook was responsible for creating the quarter-scale stop-motion puppets of Gozer's minions Zuul and Vinz, the Terror Dogs, when in motion. The model was heavy and unwieldy. It took nearly thirty hours to film it moving across a 30-foot stage for the scene where it pursues Louis Tully across a street. For the scene where Dana is pinned to her chair by demonic hands before a doorway beaming with light, Reitman said he was influenced by "Close Encounters of the Third Kind" (1977). A rubber door was used to allow distortion as if something was trying to come through it, while grips concealed in a trapdoor beneath the chair, burst through it while wearing demonic dog-leg gloves. Made before the advent of CGI, any non-puppet ghosts had to be animated. It took up to three weeks to create a second of footage. For Gozer, Slavitza Jovan wore red contacts that caused her a great deal of pain; she wore a harness to move around the set.