Despite my always whining about the zero, it's not exactly what I have a problem with. More accurately, it's how unnecessary it is on the Kelvin's registry. Prime Trek has already established starships with three digit registries, USS Grissom is NCC-638, USS Essex is NCC-173, just to name a few. So why couldn't the Kelvin be NCC-514? Why did it have to be NCC-0514?
This is only a rumor based on the fact that the Kelvin's namesake is Abrams's grandfather, but it has been speculated that the registry is his birthday (i.e. he was born in May of 1914, hence 0514. Had he been born in November say, the registry would have been 1114). Whether this is true or not I don't know, but since the other ships' registry numbers correspond to their names in some way, it's possible.
So apparently Abrams just isn't as anal-retentive or OCD about such things as some Trek fans are. And in the large scheme of things it isn't really that big a deal. He wasn't trying to change things or piss people off. He was just honoring his grandpa.