Here’s the great review for the Special Edition Blu-ray by Collider:
My favorite feature on the Blu-Ray special edition is the six-part, 90 minute long MAKING-OF-DOCUMENTARIES. This was the first time I saw how every important scene was positioned together. Another awesome feature about the documentaries is that they can be played alone or in picture-in-picture mode alongside the film starting from “Love Death Birth”, “The Wedding”, “The Honeymoon”, “The Wolf Pack”, “The Pregnancy” and “The Birth”. All of these special features walk you through the entire process of making the movie with the writers, creators, and cast. My favorite out of the six part documentaries is definitely “The Pregnancy.” Watching Kristen Stewart’s transformation, the prosthetics that were used on set, and the making of her uncanny body double were all wonderful. If you’re someone who loves watching and learning about the pre-production, production and post-production processes, you will thoroughly enjoy these documentaries.