Well, I received the DVD today and, for $14.95 this is a must have for 230 owners.
There is some great old racing footage, a lot of history of Mercedes, very interesting segment of restoration of the 300's, a great chapter on the 230 and then more info on the later models.
Not much added on the 250's and 280's other than production numbers.
The DVD was produced in 1995.
Alas, no production line footage as requested at the beginning of this post.
Norm
230 SL Blue-Grey
P.S. This video has the segment that Pagoden mentioned! The max suspension travel and the guy exiting the parked car, perfectly level is amazing (I don't think I will try that with my 230)