The "The Lady Deceives" video essay is 21:30, not 31:30.
There's also a 55-second "Preston Sturges' 11 Commandments for Box Office Success" clip stored on the disc, but it's not available on the menu. I'm not sure if it's been dummied out or if it's an easter egg; I haven't the foggiest how to figure out how to access easter eggs.