Find Mii: Different Mii
When you are playing the Find Mii mini-game, every time that you are asked to find the different Mii or Miis, start to point every Mii. If at any moment you are pointing to a Mii but instead the Mii in front of that one stands up (or the one at the back, etc.), that one is the different one (the Mii that stands up without pointing it out).