VIllages/NPC/Zombies

I was looking around seeing what was new in the new minecraft snapshot. I then found a village to the east of it was an abnormal structure. Whether it was normal or not I found it strange that suddenly a mound of dirt and stone spawned above ground. Soon I started spawning zombies. I then found that zombies could attack testificates/Villagers behind their own doors so they could attack even though there was a door between them. I also noticed that the house had gravel on all sides and it was a narrow passage and half the door was blocked by gravel. Hope I helped I like what you're doing jeb, can't wait for 1.7 where we won't have problems with mod IDs conflicting!