Commerce line item views with fields from content node
This isn't easy, because the line item has no direct reference to the node. It does store the node URL in a textfield, but that does not a Views reference make. If you have a store where there's only one product display referencing each product, then you can get away with using a reverse product reference - i.e. starting with the line item, you reference the product, and from the product, you add a reverse reference to the "node referencing the product." Then you should be able to add fields from the product display node.

If you have multiple product displays referencing any given product, this solution might not work (unless of course each node contained the same fields you intend to pull into the View).