Successfully complete the game. Then, load the cleared saved game file to start a second playthrough with all previously collected items.
During the 2D transition levels (between game sections), collect the indicated number hidden film reels to unlock the corresponding cartoon at the "Extras" menu:
- Mickey Mouse in "The Mad Doctor": 6 film reels
- Oswald the Lucky Rabbit in "Oh What A Knight": 14 film reels
Successfully complete "The Lonesome Manor" level, and return to Mean Street. Talk to the Gremlin at the Penny Arcade to find out the machine has another 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 Walt Disney's apartment. Inside is a piece of concept art and two gold E-Tickets with Oswald on them, which are worth 150 Tickets. Note: The Oswald Tickets will not appear again.