- The Happy Tree was released when the game was released, on September 14, 2011.
- On April 17, 2013, the Happy Tree slightly changed in appearance.
- On April 18, 2013, the Happy Tree changed back to its original appearance but reverted to the newer apperance on April 22, 2013.
- On April 22, 2013, the Happy Tree changed in appearance.
- The Happy Tree's description mentions, "Bob Ploss". This is likely a reference to Bob Ross, an American painter, art instructor, and television host.