My son found it! It is the button on the sleeve of the two arms making a hand puppet.
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It's in the top of the square jewelry box on the second page. Its green
The cat is riding a yellow bike at the top of the page
On the big stool on page 22. It's on the red dot thing. It is black.
On top of the red train
One is in the book on page 19. One is under the globe on 19. And the last is on the yellow block on 18.