DominicCobb said:
The alternate timeline thing was a clever way to bridge the two universes and make everyone happy, but it does create some serious headaches if you think about it too much. I find it's easy, though, to put continuity issues aside and view these films on their own, as a reboot.
NuSpock calls OldSpock and asks "Dude, how did you beat Khan in the other movie?"
Did that make anyone happy?