If you are milking a cow, and you do not have an open space in the top row of your inventory, then the bucket will dissapear, and you dont get milk or anything.

You can mine and block with a sword at the same time; you reduce dammage just like you would as if you were blocking, and you also mine just as fast as normal

You cannot go into f5 mode while on a moving donkey, however it does work when the donkey is still.

Horse armor has no durability, and is stackable. (Not sure if this really is a bug)

When you spawn, you have no expericence bar until you get a full level.