1. HYENAS
The Joker should have had HYENAS instead of attack dogs. They're crazier, more vicious and it would've shown us how insane The Joker was (not that he isn't insane, as is). And, hyenas make laughing noises. Y'know. Like The Joker.
2.
CHAOS AT THE FUNDRAISER
The Joker should have been more out of control in the fund-raiser. Don't get me wrong. That scene was great. But, I think he isn't as menacing as his full potential. He should've thrown that champagne glass or something. Or maybe shot at the champagne fountain or whatever you call that.
3.
BECOMING A BETTER CLASS OF CRIMINAL
Scarecrow should have gotten a new outfit or a new mask, at least. Just to show that he's getting a little crazier than when we first saw him, as if he was evolving into a real super-villain, a better class of criminal if you will. He's kind of like the first supervillain in the Nolanverse so it makes sense to have him become more and more like it. He should have had a maroon/brown coat or scarecrow hat or a fake hangman's noose. Or all of 'em.
4.
THE BAT-SYMBOL
The V-shaped design that holds his Bat-emblem should have been the same color as his utility belt. It's a nod to the traditional yellow circular emblem and I think that'll make it look cooler.
Can someone edit this picture with PhotoShop? Make the color of the V-shaped design like the color on his belt.
5.
TWO-FACE'S VOICE
This one I know was a conscious decision by Nolan. But, I really think this would've been just a little better. Two-Face should not have had that clear a voice, maybe. It just doesn't feel right. He should have been heavily-breathing or I don't know. I mean, try speaking with one side of your mouth open permanently. You just can't say a word without breathing heavily.
What do you guys think? And what little touches do you think would've made things cooler?