This book was more slow moving than his behind -the-scenes expose of Disneyland. If that's what you're looking for, purchase the Mouse Tales books. You won't find much interesting here. On the other hand, if you'd like to hear how the movies evolved, and enjoy uncovering hidden Disney images, this is a good book for you. You should be a fan of the animated movies to read this book, as there's little else here of interest.
It held my interest---but not by much.
Whereas most Disney authors salivate all over themselves attempting to convey the pure genius of Walt's legacy, Koenig discusses each film's flaws, often-convoluted origins, behind-the-scenes battles, and just plain bad habits with a much more dry sensibility. Yes, Disney makes magic, but they also make movies, and the book analyzes each film on its cinematic and storytelling merits. Each story is researched to compare its original form to the "Disneyfied" version, often with enlightening and surprising results; tales and insights from the folks who helped make the features and related theme-park rides merge with Koenig's own tight prose for an air of authority. Amusing and educational sidebars (such as a Disney Tragedy Trivia Quiz) and a few illustrations help break up what could have been a very long list of factoids.
Koenig's platform is that "Disney has the recipe for success," but the use of cooking quotes and analogies before each chapter comes off as an awkward, out-of-context device. Also, the book is marred by a few typos--nearly hypocritical considering the attention paid to Disney's own minor mistakes. And while Koenig clearly respects the work he's discussing, his tone is one of tough love--from urging to prodding to nearly provoking and harassing the studio to do things better. He rather enjoys sticking it to the House of Mouse when the chips (and presumably dales) are down, which will likely alienate some hardcore, soft-hearted Disneyphiles. But this book is not written for those who live in a fantasy world, only those who appreciate a good one when they see it. With excellent, relevant research and precise, entertaining writing, Mouse Under Glass is as fresh and fair an analysis of Disney magic as you're likely to find.