Dick Smith only had 4 fingers on his left hand because his ring finger was lost due to an infection after an injury. Smith referred to it as his "Mickey Mouse Hand" because the ring finger bones in the hand were removed at his request to make it look more natural.
[on how to make wrinkles:] It's simple. We stipple a special latex
formula on with a sponge, then while it's drying, we stretch the
actor's own skin -- you know, maybe pull it up from the cheekbones. We
use a hair dryer to dry the latex quickly and when we let go of the
real skin, the face will be as wrinkled as a prune. If we want deeper
wrinkles, we just add another layer of liquid latex. [New York Sunday
News, July 13, 1958]