Animal Crossing: Wild World Easter Egg - Mario Fans

Okay, here are some eggs that happen in the game:

If you bought a pinball machine from Nook's store, take the machine inside your house, zoom in your camera screen closer to the pinball machine, and look at it. You can see Mario's picture shown on the bottom part and the Kingdom on the top.

If you bought an arcade machine from Nook's store, take the machine inside your house and look at the arcade screen. You can see Mario and Luigi fighting at each other.

If you have Apollo (eagle), Pierce (eagle) or Bella (mouse) for a neighbor, go inside either house and find a cabinet, drawer, shelf, or fridge. Look inside that piece of furniture and the text "What are Luigi's clothes doing in here?" will appear.

If you have a Big Bro Shirt from the Able Sisters, wear the shirt and you are wearing a red shirt with a "M" on it (for Mario). It will go with a Big Bro Hat and a Big Bro Mustache. There is also a Lil Bro Shirt, Hat, and Mustache.