I just thought of something else: it would be interesting to find out what the puppeteers thought of all the blue screen they did. I know in the past some of the Muppeteers have said that green screen or blue screen is extremely hard on the puppeteer, as they don't have a set or anything else to work around, but they have to get the placing, eye contact, and everything else right. I think that they've said that that's why Elmo's World is such a pain to shoot, the whole thing needs to basically be done in green screen.