I've seen both volumes. Invaluable viewing.
Orpheus was also very interesting for the more overtly sexual dancing of Violette Verdy. She's kind of curvy in a way modern ballet dancers aren't, and the pas de deux with Nicholas Magallanes sizzled.
Nutcracker pas de deux: Wow, the Cavalier's variation is included! When was it cut?
You've seen both volumes? Did you order from Amazon or VAI? I followed Dale's logic, and ordered from VAI, and, for what it's worth, I've received only Volume 1 in Chicago so far.
When looking at video from Balanchine's day, people will usually notice how up-tempo the performances are, but all the dancing looks like he told them, "Bigger! More!", while Martins's dancers looked to me like he told them, "Smaller," when he took over, and that seems to continue today, in their "Balanchine" at least, although I should say I rarely watch the company anymore, partly for that reason.
Yes, Verdy's Eurydice is wonderful to see, though I enjoy the "largeness," without blurring, of the other dancers' movement, too. Very effective. Large and clear, flowing and "present"; here and now, not polished to the point of routine and remote.
Regarding the Cavalier's variation in The Nutcracker, according to the account in Nancy Reynolds's invaluable book, Repertory in Review, the Cavalier disappeared completely in 1958, only to reappear in 1959 "as support for the pas de deux, although to this day  he is variationless."