I'd rather they show the actual clips than do new animations based on the old ones (could this be to make them better for a widescreen film?).
I wonder if they'll interview Kevin Clash, or even talk about his departure (the book barely talked about any recasts, and didn't really talk much about the show after season 30, only briefly mentioning Abby Cadabby and the upcoming 40th anniversary). I doubt they'd go into major details.
It would be great if the film had focus on Richard Hunt, like the book does. Also Jerry Nelson, considering his recent passing. Of course a book can include more than a documentary can (I hope the pre-history doesn't dominate the documentary like it did in the book).
I honestly want to see the Green Grover figurine is it just a PVC or an actual action figure.
I wonder if it'll be newly-sculpted or just a repaint of an existing toy.