My favourite moment was discovering a particular character was actually a sort of pacifist. I first noticed he seemed to execute downed enemies quicker, and those he hit with a melee weapon had different animations after going down for some reason, but I was still confused as I kept trying to grab a gun and shoot, only to have nothing happen, naturally resulting in my swift demise. At some point I picked up a gun out of combat, and realized that he was emptying it, before throwing it away (which earns him points and continues the combo, incidentally). The rest of it all made sense then, as the disabled, but not murdered, enemies writhe around on the floor after he smacks them with a baseball bat.
It's a good game and a good sequel, but I think it's smart of the devs to rule out a third game.