Oops. I looked at Amazon.com again, and it does list some extra features, as follows:
# DVD Features:
* Available Subtitles: English, Spanish, French
* Available Audio Tracks: English (Dolby Digital 5.1)
* On Being A Cowboy
* Directing From the Heart: Ang Lee
* From Script to Screen: Interviews with Larry McMurtry & Diana Ossana
* Sharing the Story: The Making of Brokeback Mountain