I got the book today. Enjoyed looking through it. I haven't even fully read every page yet (I've read most).
Somehow I expected the Sam and Friends section to only include images from The Muppets: A Celebration of 30 Years (well, a promotional image, that's definitely not a still), particularly since I knew that the only characters featured in this book are ones who did appear in the special. But I did wonder if they would have included other photos of Sam, Harry, and Yorick (even if not still images).
That is a great main image of Lips. I don't think I've seen that image before, and can't identify where it could be a still from (maybe Muppets Most Wanted, but it looks like the original puppet to me, not that there's much difference between the original and current puppets).
The section on Muppet birds says that it includes every Muppet bird who doesn't appear elsewhere. It would have been great if it said something about not including Big Bird. Maybe Disney wouldn't want him to be mentioned to risk confusing the public regarding who belongs to who, but perhaps it could have said "every Muppet bird (with the exception of a certain big bird)".
Considering the lack of behind-the-scenes stuff, it's interesting how on Bean Bunny's page, Muppet Vision 3D is referred to as "Jim Henson's Muppet Vision 3D". I wonder if that's the only time Jim Henson's name is mentioned.
I was surprised to see a still from Beautiful Day Monster's debut on The Ed Sullivan Show. Don't know if it takes much to include images from productions owned by other companies in books, but considering the book doesn't have characters primarily from the Sony-owned MTM, MFS, or KSY (though I never expected KSY characters to be in this). But The Ed Sullivan Show is the only production not owned by Disney to have images in the book (maybe the owners of the Sullivan Show charge less than Sony would).
And it seems this book shows a difference between Henson and Disney regarding non-fiction books (but considering this book avoids behind-the-scenes stuff, is this book "non-fiction" enough?): Both before and after 2004, pretty much every Jim Henson biography represents almost every major productions, with plenty of photos, regardless of if the distribution rights and characters are owned by Henson, Disney, Sesame Workshop, Sony, or whoever. But this book, at least when it comes to pictures, pretty much sticks to images from productions Disney owns (with the exception of The Ed Sullivan Show).