In order to unlock the window above the Fire Station leading to Walt Disney's apartment, you must beat The Lonesome Manner and return to Mean Street. Talk to the Gremlin at the Penny arcade and he'll tell you theres another function of the machine, but he needs 30 Power Sparks to work it. Collect whatever remaining power sparks you need and give them to him. He'll tell you something has activated at the fire station. Jump up to the window above the door there, and Gus will ask if you want to enter. Inside are two gold E-Tickets with Oswald on them instead of the Mickey Mouse logo. They are worth 150 Tickets. Note: The Oswald Tickets, unlike the normal E-Tickets around the park, will not reappear.