Minecraft wiki entry for Development_versions, associated text: MC-1279 – Slow (choppy) rotating beacon block.
MC-3448 – Statistic screen icons messed up.
MC-4158 – Nether portal sometimes places you a fraction of a block in the air.
MC-4167 – EXP orbs will switch locations after a second or so from killing a mob.
MC-6261 – Brewing stand Doesn't drop custom potions.
MC-12013 – Experience orbs invisible for one second right after spawning.
MC-55661 – Animals don't teleport to player when target is air block.
MC-67437 – Lightning gives AI to witches and zombie pigman that were originally pigs and villagers that had NoAI set to 1.
MC-68497 – Cut/Copy function updates clipboard even if nothing is selected.
MC-71973 – Tab list headers and footers stay even when rejoining a different server.
MC-72524 – Can't place buttons on top of redstone blocks.
MC-72806 – When using /stop server executes the shutdown sequence twice (and hangs if players are online).