The animated neon sign outside proclaims "THE CITY'S TOP RATED PIZZA". But every now and then some of the letters flicker off, making the sign momentarily read "IT'S RAT PIZZA"! The flickering lasts about 12 seconds, and happens approximately once per minute. So if you just happen to glance up at the sign for a few seconds, chances are you'll never see the secret message!
Tucked away on a shelf in the main lobby area is an ancient can of Wilkins Coffee.
You can read all about Pa Otter here. Kudos to the PizzeRizzo designers for including such an incredibly subtle, even touching, reference.