LucasArts fansite The International House of Mojo has published this book-length restrospective (~30,000 words!) on Sam & Max: Freelance Police, the game that was abruptly cancelled in 2004:
https://mixnmojo.com/news/Mixnmojo-releases-its-memoirs-in-the-form-of-ridiculous-Sam-and-Max-2-retrospective
This one that had this trailer:
Well, it's ostensibly about Sam & Max: Freelance Police - and covers that game's development very thoroughly. But the first few parts are about LucasArts in general, and the changes in the company