Scott from Cinematical discovered that Netflix's Watch Instantly has movies that have not been released on DVD, Netflix Has Movies That Aren't Even On DVD! Like 'Rolling Thunder'!.
So while that was a juicy enough find, I thought to myself ... why not do a little more digging to see if Netflix has a few other "unreleased online exclusives." And I found some! Anyone out there dying to see Burt Reynolds in Malone (1987)? Tom Selleck in Daughters of Satan (1972)? The 1967 ensemble farce Eight on the Lam or the 1969 Jacqueline Bisset sex comedy The First Time? How about the 1959 exploitationer Diary of a High School Bride or Mario Bava's (now out-of-print) Planet of the Vampires? Also available on what I'm now calling the Netflix VHS Stack list: Michael Keaton in (the pretty terrible) The Squeeze (1987), The Glory Guys (a 1965 western written by Sam Peckinpah!), and the Oscar-nominated nympho-drama A Rage to Live (1965). Netflixers who want some of these flicks can start on this page and work backward.
Sure enough, Rolling Thunder only has the "Play" button instead of the "Add" or combined "Add Play" button.
Thanks to Gustav and Scott for sending this in.