When the designs were completed, Nicotero and Burrell educated the cast on the appearance of the creatures by showing puppets and the function of their eyes and mouths.
Studio za vizualne učinke je Darabontu priporočil Guillermo del Toro, potem ko ga je Darabont vprašal, kdo je ustvaril vizualne učinke za film "Panov labirint".