I was traveling in my little world a bit, and I found a savana, and I just saw a village. The village had some blocks with incorrect data values, such as torches facing the wrong direction, wood logs facing wrong directions, double stone slabs with data value of 8, displaying the top texture of the block on all the sides, which supposed to be unobtainable. The world type I was using is default. I'm not sure if its only Savana Villages or all types of Villages...