On the hood of the cab
The bottle-cap knight can be found on page 21 of the I Spy Fantasy book.
In upper left corner of page 18, formed by 9 diamonds.
In the I SPY Fantasy book on pages 22-23, the lake is located in the top left corner of the pages. It is depicted with a swan swimming on the water, surrounded by trees.
On which page?
No, Harriet the Spy is a kids book about a little girl who loves to play at being a spy and in fact does kinda spy on her friends and stuff. It is a fun book for grade school kids, but it doesn't have any fantasy elements in it.
If you look at the line of knights that are in front of the sand dragon, scan your eyes to the one all the way to the right, who is directly in front of the wood "scoffolding". His shield has the pegasus on it.
The chick is hidden on the page with the title "Children's Classics" in the book "I Spy Mystery."
On the big stool on page 22. It's on the red dot thing. It is black.
The book is "I Spy". Page 14. House labeled Meeting House has the bell on the front of the roof.
In the "Fantasy" book on pages 20 and 21, the pegasus can be found flying over the enchanted forest. Look for a majestic winged horse with a shimmering mane and magical aura surrounding it.
It is on a playing card (Jack of Hearts) poking out of the dresser drawer on the right hand side of page 33.