Two brief webisodes totaling around five minutes are purely promotional. Five deleted scenes run 11 minutes, and fail to add much to the movie. Secrets of 1408 is series of four featurettes of varying length focusing on different aspects of the shoot. Physical Effects is a fun one, focusing on how they build the entire room on a gimbal to submerge it in water. 
Observant viewers will note numerous little hints at the number 13. Obviously, 1408 adds up to 13. The key has numbers on it that would form 13. The first death that ever occurred in the room also happens to match up. Note the address of the hotel as well.
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