Minecraft wiki entry for Development_versions, associated text: MC-5711 – Removing a block with a redstone torch on it will not remove the redstone torch.
MC-5721 – Crash when using new inventory features.
MC-5728 – Infinite loop caused by a comparator (on subtractor mode) feedback loop.
MC-5729 – Only one block disappears when an Iron Golem or Snow Golem or Wither is created.
MC-5746 – TNT render blocks invisible.
MC-5748 – You can place anything in a container or Minecart or Furnace Minecart with the Hopper.
MC-5759 – New inventory mechanics can break crafting.
MC-5768 – TNT explosions that destroy the chest being viewed causes a crash.
MC-5773 – Breaking a chest with another player viewing the contents will kick that player out of the server.
MC-5786 – Players could not smelt Nether quartz ore.
MC-5789 – Yellow text object counter (displaying a 0).
MC-5798 – Hopper does not pick up all items dropped into it.
MC-5845 – Duplications – ingots/diamonds etc.
MC-5846 – TNT with Trapped chests.
MC-5871 – Comparator looks activated but has no output.
MC-5934 – Comparators don't have a delay.