QUOTE
Max Mode
"Max Mode" works exactly like "Read Mode" but with increased magnification. This viewing method is ideal for exploring fine details and perhaps a secret or two! In this mode, you can also move from side to side by moving your mouse either to the left or to the right.
emmaebe at heroestheseries brought up one link that was found but didn't give a location, so I'm looking for more and the location of this one..."Max Mode" works exactly like "Read Mode" but with increased magnification. This viewing method is ideal for exploring fine details and perhaps a secret or two! In this mode, you can also move from side to side by moving your mouse either to the left or to the right.
But starting with the first novel, I haven't found a link. Although maybe they haven't started populating the panels with lotsa hidden pics yet?
The Golden Crane in the center of this screenshot below looks out of the ordinary enough to be where a link is, since it stands out from the rest, but it doesn't link to a picture:
Anyone found the secrets?
Update: I found the link for another pic, even though I couldn't find it in the comic... http://www.nbc.com/Heroes/novels/downloads/hiro_line_01.jpg
(I looked in the xml files...
) They seem to be linked somewhere on the second page. 
Update #2!- Gee, mystery solved! If you are in "Read mode" the whole second page is clickable. Well, I got to look at the comic in Max mode quite thoroughly...