As an aside, I've never read the original book, but once, for my mum's birthday when she was ill in bed, I performed the play version (from a book) with me playing all the parts. I can only remember one prop which was a brown paper bag, but there must have been more to it than that. I suppose I was about ten or twelve years old.
* Edit 10.08.05: According to the Funday Times, Aug 7: "Four animal trainers worked with 40 squirrels for the nut room scene. The real rodents were supplemented by a troop of lifelike animatronic squirrels, made with real squirrel fur."