Do you see a Hidden Mickey in the jewels next to Sleepy's right little finger? The large center amber diamond with a smaller purple gem for the right ear (which is purple due to the reflection of another purple stone with a hint of blue underneath due to reflection of another stone) and which touches the end of the little finger, and the left ear seems to be an orange gem, (Disney does not list orange as an official color but it looks orange here due to reflections.)
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After the science lab is sucked up and the 3-D figure is on the screen, he transforms into a taxi. As he's driving away he leaves little smoke clouds behind. In the first cloud that appears, a classic hidden mickey is formed for a very short time in the middle of the cloud on the right.
In the first room, on the left wall as you face the portal, is a schematic drawing of one Maurice's inventions. Along the left edge of the schematic is a drawing of three gears that form a classic hidden Mickey tilted to the left. Although the three circles don't touch, they are arranged in the classic HM pattern and are properly proportioned.