Stormin' The Castle: Secret area
When you get to the fourth area when you finish Angelica, there is a secret key near the cabins in the front. When you go to the front, you will see the key. Damage the bars to get the key, then go to the back of the arena. Look up to find the gate with the keyhole. Get up there and go to the gate. Go inside to find a lot of Reptar Funny Money.
The Power Of Juju reference
Go to the igloo and enter it. Once you pass an area with many logs close together, you will find Tak from Tak And The Power of JuJu on a shelf made of snow on the right.