1) Watch the muchkin land scene when a munchkin hands Dorothy a lolly pop. Watch carefully and you can see his position change a few times in different shots in relation to Dorothy.

2) In the scene with the horse of many colors, you can see the driver restrain the horse from licking his coat. If you didn't know, the horse's coat was colored with a powdered Jello. I guess the horse couldn't resist.

3)As Dorothy is departing Munchkin land, if you look closely you can see the Mayor adjust his tummy padding.