The R2 version of Citizen Kane - the one with the yellow cover - has to be one of the worst DVDs ever. There's no extras, aside from the (rather good) trailer, and the picture and sound quality is truly awful.
For example, there's a scene near the end, where Kane as an old man is walking down a long flight of stairs. I swear, he appears to jump a dozen stairs in one go. That's how bad the picture quality has been mangled.
If you've got a multi-region player, go for the R1 Special Edition instead. Picture and sound have been massively cleaned up (Kane now walks down ALL of those stairs!), plus there's some cracking extras too.