The game was originally called Angry Birds Halloween. The title was changed to the current one in the Christmas update, wich added Season's Greedings.
This game is the first appearence of Stella and Bubbles, but they were also added to the original Angry Birds in an update.
Most levels in Piggywood Studios are references to famous movies, but the first level is simply a reference to the Hollywood sign.
This game still uses the old pig sprites from before Angry Birds Chrome, despite the original game having been updated longe ago. Ironically, the Season's Greedings animations was the First time ever those designs were used.
A bonus level in Piggywood Studios references Flappy Bird.