- The Yellow Tree was released when the game was released, on September 14, 2011.
- The Yellow Tree turned green on December 3, 2012, and was reverted to yellow on January 20, 2012.
- The Yellow Tree turned green again on January 21, 2013, and was reverted to yellow on February 1, 2013.
- The Yellow Tree's goal message states, "They were all... yellow". This may be a reference to the song "Yellow" by Coldplay.
- The Yellow Tree may be a reference to the season of autumn, referring to its yellow leaves.