The show's creators clearly have a lot of respect for the origins and history of these characters, especially Batman. References are often made to comics or other previous incarnations of them. The newest episode, The Super-Batman of Planet X! is certainly no exception. Batman accidentally gets transported to the planet Zurr En Arrh (comic fans know what this means) and meets the Batman of that planet, whose multicolored costume resembles the one the Zurr En Arrh Batman wore in the comics. This Batman's arch-enemy is Rohtul, Luthor spelled backwards, and is indeed voiced by Clancy Brown, the voice of Luthor from Superman: TAS and other things. There's also a reporter named Vilsi Valar (named after Vicki Vale, no doubt), voiced by Dana Delany, known for providing Lois Lane's voice. And the biggest grin-inducing decision of them all was that Zurr En Arrh's Batman was voiced by the voice of Batman, Kevin Conroy.
I haven't even gotten into the plot yet. Batman quickly discovers that on this planet, he has Superman-like powers, which leads to some fun scenes where he tries them out and interacts with the native Batman. Turns out he also a Kryptonite-like weakness on that planet, as anyone would have predicted, and yes, it does come into play. The episode was still a lot of fun to watch, especially the hilarious ending, and ranks up there with the best the series has to offer.
I highly recommend this series to any comic fan, as long as you don't watch it expecting another Batman: TAS. This is a different show, it knows that and loves it.