Hidden Mirror Pieces
Mirror shards are hidden in different levels of "Magical Mirror Starring Mickey Mouse" for you to find and collect. Go to the room next to the mirror room and look in the hole in the wall to find a piece of mirror. You'll discover another mirror shard underneath the rug in the first hallway you enter. The third is revealed after performing a trick in the chandelier room. Perform the silverware trick in the kitchen for another piece of mirror. Go to the room with the two princess pictures, hand a flower to the picture on the left side, and then walk through the cave; a piece of mirror is waiting. Attach a gear to the clock tower and flip the switch for another mirror shard.
Secret Items
As well as the hidden mirror shards, the game includes many other secret items that you can unlock by completing specific tasks. Go to the train room and complete the Airplane mini-game to unlock the airplane. Perform a trick in the tea room for the picture. Use the lamp on the second floor staircase to receive a Goofy plaque. Find the gear in the piggy bank room for the piggy bank. To unlock a sword, finish the Sword Chase mini-game without being hit once.
Extra Room
Play through the whole game and save your progress when asked to at the very end. In the Saved Game Selection screen, choose the new "Bonus Room" option that was unlocked when you completed the game. The extra room is Micky Mouse's bedroom, and you will appear there.
Secret Flashlight
Go to the TV room and open the door next to the television. Walk inside this room, and you will see a toy box. Open the box and you will rummage around inside, eventually pulling out a flashlight.