Here are some things to look for.
1. Frank is obviously in a good mood, although he had an audience that he was playing to (notice the people behind him in the chairs).
2. It's also cool that there were no overdubs - everything was recorded at the same time.
3. Also, notice that the conductor is following Frank rather than the other way around.
4. It's interesting that he was recorded with what looks to be an AKG D24 dynamic microphone rather than the Neumann U47 or AKG C12 condenser that are in most pictures of him recording.
I posted something similar a few years ago but the video was subsequently taken off of YouTube, so enjoy this while it's available.
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