I usually don't reply to posts asking for advice from people who have actually sat for the exam (since I haven't), but I would absolutely make a pass of the images in RR. Its probably one of the better sources for numerous crystal clear images from all organ systems, excluding a texts like Big Robbins, Rubins, or websites such as WebPath. I can't speak to the margin notes. There are so many of those that it may take quite a while, so if you're down to the wire I would stick with the images.
I've been going through just the images on RR, and they've been great. Some of them I can recognize from pathoma (always helps to see multiple views of the same thing), and some of them not (even better, I learn new pictures!). I would definitely recommend it.
When you listen to his audio he always refers to a common slide set that all pathologists have and apparently the NBME pulls pictures from on their exams. Do you know what he's actually referring to? He will frequently say this *exact* picture was on a past exam.