The InfoMoon was originally a refrigerator called the InfoFridge.
Contributed by GamerBen144
The Yellow Head costume obtained when you defeat the boss without loosing a life is actually from the prototype of LittleBigPlanet which was named "Craftworld" and featured a place holder character called 'Mr. Yellowhead'.
Contributed by Someone
A song in the game got it recalled from store shelves. The song was in Arabic, and contained lyrics from the Qu-ran. The song is called 'Tapha Niang', and the lyrics are (when translated to English):

Every soul shall have the taste of death, all that is on Earth will perish.

The song is still in the game, but the lyrics were cut out.
Contributed by DidYouKnowGaming