Putting glasses or the bell collar on the Cow cuts off part of her eyes.
Putting glasses on characters besides the Sheep causes their eyes to appear through their eyelids. They also get the Sheep's mouth during animations.
Changing the Sheep or Cow's feet to human won't actually appear until you switch to another character and back.
The Chinese dress only correctly lines up with the breasts of the Cow, Endergirl, and Panda. The rest of the characters seem to use a smaller breast scale (even with the slider).