Minecraft wiki entry for Development_versions, associated text: MC-5929 – Cannot drop items in Creative mode.
MC-6822 – Texturepacks no longer work.
MC-6903 – Rail duplication glitch.
MC-7147 – World crashes after a few seconds.
MC-8802 – blocks keep the redstone state when breaking a comparator that powers that block.
MC-8932 – Pistons can't destroy comparators.
MC-9382 – Crash with 512x texture pack.
MC-9576 – Fortune doesn't affect the drop rate of apples and saplings.
MC-9813 – "Pick Block" on certain items then switching to survival creates infinite or ghost items.
MC-9817 – When removing "Ghost Items" from the inventory, the number may be negative or zero.