Star 1: Red Coins Edit
Before going into the slide there's another path to the left with coins forming a zigzag. Go up and climb onto the ledge, where you will find the red coins scattered along with several chomps rolling. Dodge the chomps for the red coins. The star spawns on the right side of the hill.
Star 2: The Final Star Edit
Follow the slide and go through the last area with the chasing chomps to get the second star.