Ummm, I call shenanigans.
The give away is the very end when Bruce commends the E-Street Horns: "making something outta nothin'"
I would suggest that the solos were far too scripted and the parts too well meshed to be improvisation. The result was classic Dixieland jazz, and very well done, but not spontaneous. My understanding is that it is a very popular form of music in Germany.
Musicians, please weigh in, I think this was tremendous showmanship, not improvisation.