When you throw an Ender Pearl, The Ender pearl its self looks like an Item.

Your character is broken in F5 mode and in the inventory where your character is.

When typing a sign and leaving the rest of the line blank, The word "Null" will appear

When Updating from 1.7 to 14w28b, All Item frames will Disappear and Appear on the ground

The achievement "Press "E" to Open you inventory" Will stay on your screen Permanently. (Multiplayer Only)

Chest sounds are broken when you close it.