Diablo Cody
After completion of her book, Cody was encouraged by Mason Novick to write her first screenplay. Within months she wrote "Juno", a coming-of-age story about a teenager's unplanned pregnancy. The Jason Reitman-directed comedy stars Ellen Page and Michael Cera.
Dan Brown
Brown was listed as one of the executive producers of the film "The Da Vinci Code", and also created additional codes for the film. One of his songs, "Phiano", which Brown wrote and performed, was listed as part of the film's soundtrack. In the film, Brown and his wife can be seen in the background of one of the early book signing scenes. (Dan Brown looks briefly into the camera at time code 06:12 - 06:14, next to his wife, but both are a bit out of focus, so it's hard to catch when you watch the movie.)