At the Podunk Landing site, the cow's tag around her neck disappears for a second when she moos and is back again.
After Mickey tosses the cat and it hits the trashcan lid, the lid disappears.
Each time the cow is chewing at the Podunk Landing site, her right ear disappears for a few frames.
When Mickey picks up the hammer with his tail, it jumps out into mid-air for a frame then goes back in.
When Pete grabs Mickey and sways him to the other side, Mickey's hat disappears.