The dossier name that people spotted is not revolutionary... at all. Nicole's name is the one that was spotted thanks to the sunlight shining through the paper, but Mark also had two more pages in there. I'm pretty certain that inside the dossier were three pages - each one corresponding to the three players left, and on these pages were some snippets from their application. So basically, having access to the dossier allowed Mark to know who corresponded to which answer for question 18 on the quiz - a freebie +1 if he happens to pick the correct Mole.