Sumino improvises throughout. Starting at 6:35 he plays a duet with himself on melodica. And at about 14:25 he plays a short upper register trill which, I'm told (there's a clip the points this out specifically), is an answer to a ringtone coming from somewhere in the audience.
You might want to compare this with Béla Fleck's banjo version, which I've linked here.
Fascinating musician. I've been following him for awhile.
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