Well, maybe the one that 'et Lori up
That is one of the most "not buying it" plotlines of the entire series. There's no way a zombie could have devoured Lori's entire body. On top of that, walkers are not known to eat hair, bone and clothes
, so what happened to that? Even if the zombie found her body, in the time since she dies, until Rick locates the room, there's no way the zombie (or more) would finish off an entire adult corpse.