Det var väl lite onödigt
här är vad jag hittade(tog med star 5 om du undrar var red coins är):
Star 4: Five Itty Bitty Secrets
Find all 5 secret spots when you are the big Mario. one is where the cannons come out, one by the hole in the beginning, one by the enterance to the red coins (see star 5) one above the cannon, and one at the very top.
Star 5: Wigglers Red Coins
As small Mario, launch out of the cannon to the tree up above. Walk across the thin long plank and enter the cave. The coins are inside. (You need to swing across the roof for some.)