They are the hotdog buns on the two forks in the middle of the page.
The two buns in the "I Spy Extreme Challenger" game are on the table in the middle of the puzzle, located near the bottom right corner. One bun is on top of a plate, and the other is on a small square plate next to a cup.
One is on a pencil!
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It is on the camel stamp on the left page
The ace in the "You Spy Extreme Challenger" game is located under the magnifying glass on the right side of the card. It is hidden within the design of the magnifying glass.
In the Spy Extreme Challenger game, the lunchbox can be found in the living room cabinet. It is hidden behind the blue vase on the middle shelf.
In the bottom left corner on top of the musical scale and the scissors.
Theres a mouse trap with a spring on Page 25.
I think it is on the side of the can on the bottom right hand page.
The snail is right by Harry's Test. It's the shell next to it.
On page 16 of I Spy Extreme Challenger, the bell is located on the bottom left corner. On page 17, the bell is on the bottom right corner.
In the Spy Extreme Challenger, the BEST gadget can be found on the first floor of the submarine, inside the main cabin. It is located on a table next to a computer monitor.