You need to be able to get from a layer in the 3d view back to an element on the page. Right now, all you see is the reasons overlay.
You are able to do this via the details sidebar. There's an (->) arrow next to each node (which corresponds to a layer) that you can click to take you to the Elements tab.
That's a bit hidden. Can we show something more obvious? What I'd really like is a tooltip that shows the element type and its id/classes.