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The numbers are interesting.

The number 05630 (I think that's correct) is circled on the receipt (along with something that looks like a handwritten "JAVERO" as best as I can make out).

Then, on the admit one ticket, the number 66929, or 62699 viewed upside down, is visible.

Also, the name of the restaurant, TELAR, is prominently displayed on the business card they decided to put in the journal.

I tried different things with the numbers, like looking on a phone dial to make out words (the best I got was "no way" for 66292) among others. So, going simpler, I think maybe it's all pointing to Craig being the mole.

Perhaps they're making a point of putting in things with 5, which is the same amount of letters as Craig's name. The only other person in the game with a 5-letter name was Bobby, but unlike Bobby, Craig's last name also has 5 letters, which I figured out by looking at Wikipedia (and that also solved the mystery of his "SLIKE" shirt for me :p).

In addition to what I've already mentioned, there are 5 links in the chain on the last page. And also, the middle one is broken and looks like a "C".

Also, the things others have pointed out, such as the grape stains and the doodling robots and food.

Plus, someone could have put this together who wasn't paying attention and just assumed everyone was blindfolded in the luge challenge. So perhaps them changing that only told us some stupid person put it together rather than trying to hide a clue.