Re: shocking revelation...
Actually, that's just the way the animation is drawn. It's easier to draw a human hand with three fingers and one thumb than it is with all five digits. I belive its also not as difficult to make the hand in proportion to the body with the missing digit. I know if one were to look in other cartoons, I am fairly certain you'll find other examples.
B'tuur jatne tuur ash'ad kyr'amur.- "Today is a good day for someone else to die"