Most DVD's tend to have similar types of extra's, including the ON/OFF Commentary, the Featurette, the Production Notes... stuff like that.
Just curious what your favorite extra features are. How often do you rewatch a movie (particularly if it's a rental) just to hear the commentary track(s)? Do you sit and read the pages of text notes?
So which features are worth the time to watch and consider before you purchase a title?
Which features haven't you seen that you think would be cool?