Under the church, there is a sign for a fight. One of the fighters is wearing Majora's mask from The Legend Of Zelda Majora's Mask, and the other is named "Mega Hombre" who is obviously Mega Man.
In the church in the top-left corner is a secret passage. At the top there is a secret message written in the alphabet from Fez. The message itself is actually a reference to the movie Christmas Story, as it translates to "be sure to drink your Ovaltine".