Pinocchio: Look for the 'Hidden Mickey goldolas' on the ferris wheel once you pass the doors into Pleasure Island.
Haunted Mansion: In the foyer, if you look towards the ceiling with your head up against the wall, while looking up into one of the corner candle holders. There's a Hidden Mickey. Make sense?
It's easy to take a quick pic of with flash..
I wonder about the history listed in the first link: They suggest Hidden Mickeys began in the 1980s or late 1970s... But what about the likes of the hidden Mickey that used to be formed at the spaceport in the movie portion of Voyage to the Moon/Mars?