The scripts were at one time available in book form. The documentaries have been released on VHS and laserdisc. The trailers, interviews, and behind the scenes footage appears on the Definitive Collection laserdisc. The only thing they couldn't get on The Executor Box Set from the laserdiscs was the 400+ still photos. Luckily, all of the Definitive Collection supplemental material is now on DVD thanks to fans on this site.
It is a great looking set, though.