Trailers:
Hidden bonus trailers can be found from within the "Cast and Filmmakers" section of this disc, as follows:

On the fourth page of Michael J. Fox's entry, you'll find a trailer for The Frighteners.

On the fifth page of Michael J. Fox's entry, you'll find a trailer for The Secret of My Success.

On the fourth page of James Woods' entry, you'll find a trailer for Casino.

On the fifth page of James Woods' entry, you'll find a trailer for Videodrome.

On the fourth page of John Badham's entry, you'll find a trailer for Bird on a Wire.