In addition to being a huge fan of Roger Rabbit I also love the old Batman Animated series. Recently I bought the Gotham Adventures paperback which includes several stories based on the series. Why am I telling you this? Well you see, in the first story there is a page which reminds me a lot of the hidden room scene from the movie. Could be meant as a homage or just a coincidence. Either way, I am posting the page in question. Read the three last panels of the page and decide for yourself.
And if you know about any other references or parodies of Roger Rabbit, then feel free to let us know. I remember him having a cameo of sorts in Tiny Toons once but haven't got a clue which that episode was.