Firstly, your head starts jittering like crazy when moving certain diagonal directions. Your head can also do a complete 180 when standing still certain directions, as if you’re looking completely backwards.
Sometimes, the title screen / server select will have a glitchy flickering black bit in the lower right.
Sometimes, NPC text will be spaced an extra line due to the text dialog box being too small.
Not sure if this one is really a bug, but the chat input box is in the middle of the screen basically, no where near the chatbox itself, even on 1080p fullscreen.
DirectX Diag information: http://pastebin.com/hUfDZ28G