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Feather drops VERY VERY rarely from zombies, and is not collectable

Extra Feathers For Player 2

Zombies unable to break doors

Zombies only fight back against players

Mobs don't swim up

Zombie / Villager Zombie can't shoot bows.

When a zombie picks up an item and dies without the player killing it, it wont drop the item it picked up.

Zombies drop rate

Able to be pushed by mobs / players when taking damage

Zomie texture distorted when using a texture pack

Only Wither Skeletons drop their head

Zombie Noises

Zombies first walks slowly, and then walks normally when punching it with your fist.

Baby zombies are not spawned when right-clicking onto an adult zombie with a zombie spawn egg

Rotten zombie flesh will fill up your hungerbar

Zombie Holding Zombie Spawn Egg Graphical Glitch

Zombie pigmen/burnable mobs in the sun use up helmets

Zombie breaking door crack appears in easy and normal difficulty

Zombies with items not dropping it on death

zombies sometimes stop attacking

Skeletons attacking like zombies when hit in creative

Zombies Infinitely Break Doors

Zombies Can be Dumb

Skeletons do not use the bow drawing back movement.

Peaceful zombies

Real zombie sieges fail to start (fix included)

Village siege's spawn location is calculated incorrectly (fix included)

Lily pads (and probably other items) appear grey when held by zombies

Zombies Not Breaking Doors SMP Server

The item that mob's taken can not be superimposed by others.