Here's something I have noticed a lot; a sharp, thin black line will appear (graphics glitch) at random places on the LCD when playing video of any kind, when in landscape orientation. It is especially noticable if you full-screen a YouTube video and then quickly pause and resume it, multiple times.
I think this is a rendering or GPU issue - I am not fully in the know about the precise mechanisms and software techniques that render pixels on Android, but it is *very* noticeable.
Finally, if you look carefully when the screen is dimmed (I used "screen filter" app) you will notice banding where every other row of pixels is slightly dimmer than the other row before it. Even staring at an app icon on normal brightness, a visible amount of shimmer or rippling is noticeable. It's not enough to warrant me complaining - not for such an amazing device, but it is very obvious that these glitches need some fixing, hopefully with firmware updates.
Edited by glossywhite, 09 October 2013 - 11:24 PM.