Well, among other things:

When the story first broke, the news services published a copy of Zimmerman's mug shot. Other than looking surly, with the eyes of a dead fish, he looked intact.

Within a few days, and after Zimmerman claimed that he shot Martin in self -defense after being attacked by Martin (punched, and his head banged on the sidewalked), someone on his defense team published a badly photoshopped job on the same mug shot, making Zimmerman's fish-eyes look kind and friendly (I think they borrowed them from an old still of Mr. Rogers) and had lurid looking blood smeared on his face and forehead.

You mean the police wouldn't have at least given him a little first-aid before taking the mug shot?

Also, some elements of Zimmerman's story contradict each other.

In my opinion, Zimmerman is a self-appointed vigilante, he had a gun, and he wanted to use it. And a black teen-ager, on his way back from a neighborhood store where he bought a bag of candy, just happened to wander into his sights. "Aha! Ideal! Who'll ever question it!?"

Don Firth