I have realised this problem since a few months ago, its most apparent in Whatsapp and calculator app. It gets annoying when you wan to reply a message and tapped the screen to light it up, then a popup option comes out and ask if you want to forward of delete the message. In the calculator app, it only highlights the number and does not register, which prompts you to have to press another time.
Furthermore, the tap and hold bug also causes the lock screen to hang in the air. To reproduce this, press your power button (double tap works too), wait until the screen starts to dim, then swipe up normally to unlock the phone. The lockscreen will hang midair. This bug if left like that, also causes the screen to never (not sure) turn off, because it register it as a constant tap.
08-15-2014 10:31 AM