Minecraft wiki entry for Development_versions, associated text: MC-6055 – Powering noteblock with redstone block or torch does not work when powering it twice.
MC-7058 – Brewing stand comparator output inconsistent.
MC-7098 – Non-standard resolutions (and small standard resolutions) not detected properly.
MC-7208 – Missing quartz, hopper, and comparator textures.
MC-7249 – Quartz slabs and double slabs using wrong texture.
MC-7296 – lower resolution textures glitch.
MC-7520 – Inconsistent distribution system (based on hopper, hopper bug) using rails and minecart-chest over hoppers.
MC-7771 – Comparator not updating status after reloading chunks.
MC-8264 – piston arm disappears briefly when placed on an active power source.
MC-8426 – Crash caused by vertical wiring (half slabs / glowstone / full blocks).
MC-8806 – Hoppers stop working on chunk reload.
MC-9181 – Minecarts with Hoppers duplicating items when multiple carts are in the same space.
MC-9341 – Powering 2 pistons extends the wrong piston.
MC-9357 – Mobs with the old AI have inverted head movement.
MC-9363 – Rows of Vertical Down Piston Extenders have a >50% failure rate.
MC-9531 – Graphical glitches involving pistons.
MC-10312 – Minecraft crashes when a saddled pig you ride dies or when changing between rideable entities.
MC-10355 – Animations for items and blocks do not work properly.