It IS the NYPD ... they manipulate crimes statistics etc.. maybe this is what you meant by "unusual"?
Top of the line law enforcement they are not.
They have managed some very remarkable things, and have some cutting edge people and procedures, so I don't know that I'd be so dismissive of them. As for manipulating stats, well, that is a problem everywhere. You do realize that UCR/NIBRS reports are voluntary and can vary to some degree by reporting agency, correct? I recall an agency out here in the 90s that reported misdemeanor domestic violence that did not result in an arrest on a numbered field interview card and that was how they got away with complying with the state reporting requirement, but also got away without adding it to their UCR statistics.
I am not sure of what manipulations you refer, but stats are easily manipulated, twisted, or massaged depending on what you want to do with them.
By "unusual" I mean that they have a few procedural idiosyncrasies that often befuddle other agencies in other states. Not that they are "wrong," per se, just that they are different. The one that hit home personally a few years ago was their practice of not issuing an arrest warrant for wanted persons until after they are located. We had three homicide suspects in our area that they wanted but we would have been unable to do anything about them as there was no warrant in the system and aside from a handful of us that knew about their BOL, no other officer or agency in the state would have been able to identify or even lawfully detain them, for the most part.