One thing I love about buying films or TV series on DVD as opposed to VHS is all the bonus content that comes with it. A set of good extras is sometimes the difference between buying a DVD or leaving it on the shelf to me.
So when I made the big mistake of stepping into HMV during a sale and saw that the DVD of A Few Good Men was packed full of extras I left quickly, thought about it for a few days and then returned to pick up a copy. I love the film anyway, so why not pick it up?
Anyway, the most interesting extra on the DVD is a section relating to the adaption of the original play to a screenplay. While the parts with director Rob Reiner are somewhat interesting I found the interview with writer Aaron Sorkin fascinating. Stories as far apart as putting original ideas on napkins while he was writing the original play (which working as a bartender) to struggling to convert to a screenplay format. Very, very interesting. Highly recommended.
P.S. Typical, I recommend Sorkin and then I go to his wikipedia page which mentions he has some interesting ways of getting inspiration. Still a good writer though.