The usual garden variety studio
special features are on hand, including an
alternate ending, eight deleted scenes, and four mini-segments devoted to various aspects of the film, including an overview of the Insidious
universe, a glance at The Further, a featurette devoted to Shaye's Elise, and even a small homage to this newly designed demon specific to this fourth chapter.
I'm sure some of these people live in a
special government funded
alternate universe — no need for real experiments, words and concepts are redefined to suit the madness de jour, and facts become nothing more than irrelevant hindrances.