Any "behind the scenes" info?

[RoloCorgi]

As an engineer, I've always wanted to learn exactly how the Bear costume worked and, more generally, what the set was like outside the camera's range. For episodes like "Tutter's First Sleepover" and "This Is Your Life, Bear" that have scenes with lots of characters at once, I look at all the puppets on the set at once and wish I could see how all the puppeteers squashed together like sardines to get those effects. Seeing those sort of "below the set" shots of "Sesame Street" was totally fascinating.

Does anyone know of any information in print or online about that sort of thing for BITBBH, along the lines of "Sesame Street Unpaved"?