The slightly folky/Indian influence towards the back end of this song is largely due to the Eb chord. This simple but effective idea creates a completely different sound/colour and even hints at the Eb notes used for the F Mixolydian scale used in the violin solo. It’s ‘borrowed’ from the parallel tonality of F minor. If we look at the chords side by side, you’ll be able to see the subtle differences: The use of the bVII chord is really common (as is the IVm) but any of the minor key chords could be used as a substitute. This is only the tip of the iceberg, however; if you really want to explore this further, parallel modes can also be used (instead of the parallel minor), throwing up even more weird and wonderful chords that can be ‘borrowed’.