this has happened to me too like 4 times i took pics. look up superflat and there should be a error report by nathan welch (me)
really? lol this is the first time i had heard about it.... and it really messes up some redstone contraptions when you make a mob killer for example and they drop loot. it would stop the mine cart and you would have to manually push it agian
happened to me too, my iron golem stared at a creeper for 5 mins then it attacked it causing the creeper to blow up, then the iron golem attacked the spot where the creeper used to be.