The top of the hood is covered in many small windows that are almost clear (not white, like those of a Sarracenia minor for example). These windows are believed to serve a special function: disorientate insects once they enter the hood so they (i.) don't escape and (ii.) are more likely to tumble into the pitcher.
But do the windows actually work? I was out with the camera a few weeks back and happened to see a Polistine paper wasp trapped inside the hood. The below .gif animation is the result of photos taken at nearly 4 frames per second.
I will take some decent photos of my Darlingtonia setup shortly and describe completely how I grow and propogate them.