This is a very cool post about Layla - with the layers of tracks separated. You can hear the backing tracks peeled away from the main part of the song.
Layla Isolated Guitar/Vocals & Separate Backing Track
That coda at the end always makes me think of a different song, but not one I can identify. It just brings up the edge of a song I think I heard when I was young but never fully registers.
Also, it makes me think of Goodfellas, but Scorsese song usages always do that. Janie Jones is linked to Bringing Out the Dead now, too, pretty much forever.