As you enter the Disney Animation Building you will see bubbles along the walls.  Some of the bubbles on the walls form classic Hidden Mickeys.

It’s difficult to say if any of these bubbles are purposely put into the shape of a Hidden Mickey.  This was stated in the Hidden Mickey Guide book.  You make the call if they are there on purpose or just coincidental.

See pictures of the Hidden Mickeys on the walls of the Disney Animation Building.

If you look at the Disney Animation building from the outside you will notice a flagpole above the entrance.  At the tip of the flagpole there is a classic Hidden Mickey.

Below is a picture of the Disney Animation Building Flagpole Hidden Mickey.

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As you ride Monsters Inc at Disney’s California Adventure pay attention to the control panel toward the end of the ride.

There will be all sorts of buttons, levers, and switches.  Towards the center of the control panel you will see a turn dial and two circular gadgets above it that form a classic Hidden Mickey.

Below is a picture of the control panel on the Monsters Inc ride with the hidden mickey.

Inside the building of the Monsters Inc ride at Disney’s California Adventure there is a poster on the wall that says "Monstropolis" with a picture of a yellow cab. 

If you look at the headlights of the cab you will notice a classic upside-down hidden mickey.

Below is a picture of the Monsters Inc hidden mickey.