I have now had three... THREE retina displays.
The first time I had tiny cracks like pinhead cracks in a cluster in the middle of the screen. The second screen had a dead pixel. The third I cleaned today and noticed two small pinhead sized cracks again.
I have no idea how this happened... I take very good care of this, especially since the first incident. Each time it was replaced by Apple Care but that has now expired. I have a THULE case and now I'm thinking that the only way to resolve this in future is to get a screen protector.
How did everyone else's happen?