This lock resembles a classic Mickey. It's on the right as you exit the Pirates ride and on a back door to the Pieces of Eight shop.
Plate and saucers in the center of the ballroom table. Some of the plates are set up as Hidden Mickeys.
Dark smudges on a sideways treasure chest on the right side of Jack's treasure room form a hidden mickey!
Look for Hidden Mickeys in Club 33 on the server's vests. This is the only known Hidden Mickey in Club 33.
As soon as you walk into the front door of the Haunted Mansion, and prior to entering the stretching room, go to any of the candlestick holders on the wall and look up from underneath. This is a GREAT HM effect!