I believe this is the film that flop so badly at the box office that it caused director Robert Wise and Fox to go their separate ways. Eric, Sorry you feel the dvd doesn't warrant a purchase which is one of the reasons why Fox probably didn't go to a lot of expense placing extras on this dvd...
Didn't Fox lose a bunch of money on this title when it originally released it? It's not a well-known film nor is it considered kindly by the movie critics.