I still maintain the Joker's shcemes were far too complicated for The Joker, like countng on being caught and stuff. It all smacks more of the Riddler. So the fanboy in me just reasons maybe Edward Nigma was employed as some some sort of tacticle advisor.
Someone also pointed out that with the Tumbler destroyed and the Lamborghini featured, the next batmobile will be designed as a cross between the two. You can look for plot holes, or look for clues to brilliance, even if they're not there.