It is possible to trap enemies like the Beetleworks and Robot Pirates. First, lure the enemy to a spot where you can thin things out. Thin it out, then quickly repaint it. If done correctly, the enemy will be trapped and be unable to move or attack. If you die, they will be free again.
Gilda, a cow on Mean Street, will ask you to retrieve an axe from the Slopes area of Mickeyjunk Mountain. Obtain the axe and go to Oswald's lair. Thin Oswald's huge face in the floor to find a hidden room. At the end of the secret passage you'll encounter unthinnable bars. DO NOT use the axe to explore the area, but instead go back to Gilda. You'll be able to come back to Mickeyjunk Mt. later in the game and pry open the bars anyway -- even without the axe.This quest earns you both Hero and Scrapper credit.
Complete The Lonesome Manor and return to Mean Street. Speak with the Gremlin at the Penny Arcade to find out the machine has a different function, but requires 30 Power Sparks to activate. After the Power Sparks are given to him, he will tell you that something has activated at the Fire Station. Jump up to the window above the door at the Fire Station. Gus will ask if you want to enter. Inside are two gold E-Tickets with Oswald on them, which are worth 150 Tickets. Note: The Oswald Tickets will not appear again.