Could it be argued that the Lord of the Rings/King Kong/Hobbit blu-ray sets are among the best as far as special features? I've watched all the features for LOTR and Hobbit and it took a while but well worth the time. I guess a good supplement to this would be the book Anything You Can Imagine which came out I think the end of 2018. But yeah totally in depth on every facet of how these movies came together, I think others pale in comparison. Fright Night's bluray also has pretty good special features too.