Okay, mine's admittedly silly. It's the Reds black shirts and black caps they wear with the road uniforms. They're especially hideous when a player wears the long red socks with them. If they're gonna have the black sleeves and caps, then wear black socks for heaven's sake.
Another also has to do with uniforms, and is equally nitpicky. It's the colored jerseys teams wear during games. It looks like they're still in batting practice. Stick with the gray or white, please.
The third is that darned notch they put in GAB.
For what it's worth, though, traderumor, I'm completely with you on the "saves" thing. It's the most overrated statistic in the game.