My brother sent me this link the other day. We are both big Royal Tenenbaum fans, and these captioned video clips explain the design influences and decisions in the movie, made by Matt Zoller Setiz. There are 5 "video essays", and each one covers a different topic! My attempt to upload the video directly to my blog was thwarted, so you'll just have to go all the way over to the website to watch it. But it's worth it!