What was wrote on that bit of paper.?
When they looked at it and it glowed yellow..?That would make them famous and change history.?
The letter to Hollywood?
-SPOILERS-
"Dear Hollywood, please stop making so many crappy movies..."
"Tips to help: story is king; remakes; Jude Law; Han shot first; more Firefly and/or Serenity".
You can see that while he's doing the "list", he remarks 2 parts with a square that you see when he finishes the list, cut the paper out of the book and puts it on the table. When you see the list just before getting wet, you see is the same list.
Also, Millie says "this is as good as it gets, you won't change or alter the culture"; so, I would say that the list did change Hollywood's way of making movies :p
In the garden however it seems they were referring to something on the other side of the paper to the Hollywood list. You never actually get to see the other side of the paper though I think and then its destroyed. I think its just one of those things that are to be left to imagination or "Imagineers".
But I think after their time travelling / parallel universe adventures are done, the writer will have enough material to become a international (or intergalactic?) bestseller and then get his own island. And no death this time since that whole pub death fiasco is out the picture. Of course if you wanna think there was an island death fiasco thats everyones perogative.