New "Platoon" has a HD remaster, 2 new documentaries, 12 deleted scenes, and a DTS track though, in addition to the specs from the 5 year old SE.
BTW, both "Transformers: The Movie" and "This Island Earth" are getting re-releases in a couple of months. Specs are iffy, but if you couldn't afford the originals, now's the time. I dumped mine already in anticipation.