Minecraft wiki entry for Development_versions, associated text: MC-3352 – Arrows fired into a repeater / comparator / jukebox / command block / hopper / daylight sensor that is updating will play the arrow hitting a block noise
MC-4132 – Piston placement issue past 16777217
MC-4789 – Gravel And Sand Falling Through Piston
MC-84566 – Arrows fall off dispensers/droppers when they are powered
MC-89030 – Pistons warp entities too much (Pistons pull entities in/through blocks)
MC-93814 – Equipping Pumpkins/Mob Heads through dispenser often play "dispenser failed" sound
MC-98093 – Distorted pistons
MC-105096 – shield animation glitch (wiggle)
MC-107998 – Animals not running away when on fire