Hello,

I bumped into this performance of "All the best" by John Prine

https://www.youtube.com/watch?v=PBksI8zbhrg

[From 14:45 - 17:40] 

I can't understand how to obtain that sound: he uses the  clean right hand but it seems that he pulls up some  chords during the up strumming.
Can someone please, explain me?

Thanks