I thought I had a perfect phone but just a few moments ago, as I was typing my password to download a new app in the app store, a few little glitchy lines appeared down at the keyboard on either side of the screen, starting at the edge and coming in to just about halfway over the A and L buttons. only appeared for a few seconds as I was typing it in. Tried to nab a screenshot to see if it would show up, but no dice. It's as if about 4 or 5 random lines of pixels started spazzing out for a bit. That's the first and only time I've noticed it all day so far. I've had the phone since 10 this morning. If it ever happens again, I'll probably head up to an Apple Store or at least try to document it if I can.
*edit* in case it matters: Phone was plugged into my Mac at the time.