At the scene when Charlie and Irene come upon the cow when they try to move it (pretend to) Irene seems to be a little overzealous and you can see the whole cow move very easily about 1/2 an inch to the right as soon as she pushed on it.(Not that big of a slipup..but noticeable) Also, when Charlie shoots the cow in the head, he unloads 9 shots into the cow. Later in the movie when the crooked cop is explaining "Charlie goes for bigger game...." He says he put 6 bullets in the head of a prize cow. Even if they were over-expressing the life expectancy of that cow....I guess they just forgot to count.