Its not actually reversing the worlds rotation, it signifies him flying backwards through time.That said:OT: I'm going to have to go with the ending of Superman, you know where he flies around the world to turn time backwards, it's not because of the fact that this defies physics, but because it defies logic, it was only introduced at the last second, and never mentioned again.
In fact whilst I'm at it the ending to Superman 2, the mind erasing kiss, why were we not told that Superman could do this before? Why didn't he just snog Zod and Luther so they can forget being villains?
Zod is a Kryptonian, he is likely immune. The erasing effect only wipes out memory, not who you are.