The moon in I Spy treasure hunt is page 28-29. Its to the right of the wishbone tree and above the cart. The moon is actually a rock figure.
its right next to the bottom left corner of the old castle above the brown carriage
Handle on drawer. Page 13.
The two coins are hidden on page 10-11 of the treasure hunt book. They are typically disguised within the illustrations or text, so you'll need to carefully examine the pages to locate them. Good luck on your treasure hunt!
On cave ceiling on page 24
upper middle crack of the page
On top of the barrell under the net
The mermaid is in the land in "now they're looking for me on land and sea ". On page 15. The land all by itself
In the middle of the U & R in Treasure Hunt, Just look below on a stick on the ship. Close to the flag.
It is above the door.
It is on the coin in the left side of the bucket
It is written around the edge of the bucket.