Tom Odell is extremely good. It is not easy to find out what he plays exactly.
This is the end of the song, starting from 3:45, lyrics "It's the same old conversation..."
He uses those notes to put some rhythm.
Thereby he put many extra notes, and much more complicated rhythms. But they are not 'essential'.You can delete them if you want to.
Here is the whole song, I split up in three parts:
Part 1 is until 1:43