"Screenwriter Melissa Matheson accidently left the entire "Breaking Dawn" script in a restroom in Louisiana before filming on the show began. As if leaving the script wasn't bad enough, her top-secret notes were with it as well. Thankfully, a hotel worker returned the script and her notes to her completely intact."
http://www.starpulse.com/news/Lisa_Forester/2012/11/10/5_fun_facts_about_the_twilight_series