There is something thrilling about seeing a contact sheet even without notations that makes me feel like I am behind the curtain.
Why? I think because the contact sheet is evidence of artistic process and, when marked, lets us in on the post-creation creative deliberative process - and, in the case of Marilyn's markings, collaborative process. Plus, it invites us to participate in that process - "ah, right, that one is not as good."
If we thought the red X was an artistic flourish, would it excite as much?