Freak of Training is an interesting DVD, but doesn't explain his system at all.
There is a lot of mystery surrounding Schroeder and I think a lot of it has to do with the "crazy" methods he employs. I really don't think his system is that crazy, kind of similar to Inno-Sport (if you are familiar with them) in a lot of ways. I know Jay is very big on recovery techniques, he uses methods such vibrational massage in between sets.
I believe the core of his system revolves around using isometrics to increase stretch-range strength (which correlates well to full-range strength) and using a lot of rapid-eccentric or plyometrics drills. He's big on force absorbtion stuff such as depth landings for lowerr body (in a squat position) or upper body (in a push-up position) and various derivatives.
Check out Inno-Sport if you haven't yet if you are interested in this style of training- it's NOTHING like Westside!