Fox and the Hound, The Easter Egg - Hidden Mickey

Right after the scene where Todd knocks over the pail of milk, the woodpecker is chasing after the caterpillar. When the caterpillar goes into the tree he is pecked at once, then three more times. The last three pecks form the shape of a mickey head in the bark. You may need to pause it and put it on freeze frame to see it, it is very unnoticable.