Shop icons, especially in Aubury's rune shop, have a small hitbox that's only about 1/2 of the image.
Example: http://i.imgur.com/qF8vpup.gifv

Spirit shields have a recoil effect that deals 10% damage to your opponent everytime you receive damage; however, this effect only works on the arcane spirit shield, none of the others.
(no screenshots, but I tested this in game)

When using the search option in the bank, it sends a PM to the last person to PM you (if you hit enter after closing your bank).
Example: http://i.imgur.com/BaQw6Z2.gifv

The spellbook when selecting an autocast spell shows 42595/2 instead of 42k/2.
Example of the text when selecting an autocast: http://prntscr.com/8dg01b
Example of the text in the spellbook: http://prntscr.com/8dg3k8