(Tested on multiplayer only)
Please see this video (http://youtu.be/hcOMmZRxNTk) and attachments.
To reproduce you will need to press F5.

Notable things:
-The head is not appearing for myself
-Entity (includes "block-entity" like chests, signs, and itemframes) will appear on wrong places, depending of the entity (for example if it is a chest or sign) it will disappear and reappear sometimes
-Other players also noticed this problem, but they don't need to press F5
-Inventory disappears or change position