I did the severed walrus arm shot along with Gary Kurtz in early 1977. Several days before we were to do the insert Gary brought the sleeve with him but not the correct hand . I dressed it with raspberry yogurt and red food coloring put it on a white plastic light diffuser and poured on sand. I believe it was the hand for the wolfman that was owned by Rick Baker. He lent many of the characters that appear in the bar scene. I also tried it with a severed head but Kurtz thought that was too gruesome . The real hand of the walrus did not look like the one you have illustrated. It was more like two fat fingers with flat nails, kind of like a sloth's fingers but with short , wide nails.