Minecraft wiki entry for Development_versions, associated text: MC-127 – Piston extended and retracted at the same time.
MC-195 – Flowing water still drags the player while flying.
MC-515 – Chest glitch that lets them appear as if they are opened while they are not.
MC-519 – Achievements lost after update.
MC-562 – Breeding cows can consume more than one wheat.
MC-835 – In the server log, /say commands performed by the server do not appear to be in the console but do appear to the players.
MC-1914 – Mob spawners sometimes show up as pig spawners.
MC-2503 – Boats and minecarts should not be dropped in Creative.
MC-3316 – Armor enchantments (besides Thorns) have no effect on mobs.
MC-3981 – Dispensers no longer dispense item through blocks in the downward direction.
MC-4052 – Powered redstone mechanisms react to change in redstone power level.