In line with the tantalizing idea of a commercial, restored version of this film mentioned in the two preceding posts, there's been a tantalizing glimpse of what that might look like on YouTube
As to the corps, yes, that was NYCB, beyond stellar, right down, if that is indeed the word, through the ranks. That's one of the things that astonishes in the mid-60s films of Don Quixote
and A Midsummer Night's Dream
- both large cast ballets - as well: The energy and freedom, the fullness, of their dancing. It was a real company, unlike today, when NYCB's defenders ask, "Oh, but did you see [principal] so-and-so?"
As to the scherzo, I'm sorry, but both its music and its choreography seem a little weak to me, as do that of a number of other numbers Balanchine saw fit to eliminate over the years, like the Servants' Dance in Prodigal Son, recently restored by TSFB, or the Hoop Dance, the fourth divertissement, in La Sonnambula, restored by Cincinnati Ballet in 2002. (What he did to Apollo, though he had every right to do it, was awful, however.)