Check out the site Cloverfield Files to see 15 exclusive behind the scenes featurettes not found on the DVD. The twist is actually being able to access the videos. You need to undergo a series of puzzles to access each video by spotting the differences between two photos, answering trivia, or putting scenes in sequential order.


Here's what the videos consist of, from Cloverfield Clues:
1. The One'r: A look at the unique style of the film.
2. Amature Naturalism: The Challenge of making the movie look realistic as a handheld camera POV.
3. Casting Beth: A look at the casting of the character Beth with actress Odette Yustman.
4. Casting Jason: A look at casting the character Jason with actor Mike Vogel.
5. Wall of Dust: An in-depth look at one of the practical effects used in the movie.
6. Destruction: Production Designer Martin Whist's re-creation of a destroyed New York.
7. Casting Rob: A look at casting the character Rob with actor Michael Stahl-David.
8. Subway: Making a San Pedro abandoned warehouse look like a NY subway.
9. Casting Lily: A look at casting the character Lily with actress Jessica Lucas.
10. RataCloverfield: How rats were used in the movie.
11. World of the Parasite: Making parasites come to life.
12. Marlena's Death: Making a death scene realistic using practical effects.
13. Sideways Apartment: Recreating a destroyed building/apartment.
14. Military Element: Using real soldiers in the making of the movie.
15. Shooting Style: Translating the creator's vision to film.