I know that there are some secrets with CP that you can do.Here are a few of them. (don't tell!)
. If you keep waving your mouse around on catalogs like furniture and clothes, you might see a yellow sparkle. Press it, and there will be a secret item!
. You can do special dances with some clothing for your penguin. Take everything off and press D, you'll be doing a dance!
. There are special emote combinations you can do, for chocolate ice cream, press E and W.