Carol,
when you are looking at the tree after the D are you seeing the letter/number in the same way as the other letters on the page? I'm seeing them in sort of the negative space, that's how i was looking at the last tree and wasn't seeing anything real definite...
I'm not sure if it was page 86 with the 5x5 box, for some reason i thought it was 89, but it is the 5x5 box with the h in it and some of the boxes blacked out. The numbers are very faint. i was holding the page up to a light, and adjusting the angle of the lighting, I was actually doing this with several pages, when it caught my eye. it took a while to figure out if there really was something there, but after playing around with it for a while there is clearly a 2 in that 1st box 2nd row, when I say clearly I mean it is deliberate, centered in the box, it is a large number taking up most of the box.
There are other numbers in other boxes as well but they are difficult to make out, partly because they are just hard to see, partly because the h is partially blocking them. If anyone else sees these please respond...