Bought the 4 disc set about 2 months ago. Really love the special features. Do any of his other movies (other than TCM) have special features? Also, when I received the collection, Drums Across the River was defective and they send me a complete new collection. What do you do guys do with duplicates?
You could try giving them away to friends or family I guess. As far as other dvds with extra features on them, I believe you've already seen Apache Rifles, which is one of the few American dvds that does have special features. The Whispering Smith dvd set includes a mid-fifties short film with Murphy selling US bonds with the help of his son Terry.
There's also some German dvds with lobby card galleries, similar to the ones on the TCM dvds, and some French dvds with a kind of introducer/commenter/talking head similar to Ben Mankewicz on the TCM dvds, only in French of course, and less about the making-of trivia and more about the general themes and subject matter of the films. These French and German dvds won't play in most American dvd players, and the French guy isn't really saying anything the average Murphy fan doesn't already know, as best I can tell.
The only Murphy film besides Apache Rifles with any kind of documentary about the making of the movie on it is the French Blu Ray version of The Unforgiven. Which is also not compatible with American hardware. It's nice that the French remember him fondly and comparatively respectfully, since Murph was one of the many, many Allied soldiers who fought to free France from the Nazis. But it would be nicer if we could get some of the films they've released (Walk The Proud Land, Column South, Guns of Fort Petticoat, Destry, Seven Ways from Sundown, etc) over here too.