The cheat menu can be found under the settings tab in the main menu.
Be aware that if you enable cheats you will not earn any achievements anymore with that savegame!

Cheats are:

• Add $100
  
• Unlock all characters
  
• Sign the complete Year Book
  
• Unlock the full guest list with 8 entries
  

The update also features a variety of bug-fixes.

Enjoy! :)