Factual error: When Julia Roberts takes a photo of Natalie Portman crying she uses a 35mm camera. The final photo in the gallery is from a Hasselblad type camera shooting a square format. All the prints show the full negative and the outside area of the negative. Also when she uses the 35mm camera sometimes she advances the film manually and sometimes you hear a motor drive. It would be either one or the other. Last she doesn't focus the lens when she takes a picture.
Factual error: Jude Law and Natalie Portman are chatting on bus number 109, signed 'Westminster' and driving up Whitehall. Route 109 goes from Brixton to Croydon and nowhere near Westminster, and does not use the old Routemaster bus they are on.
Factual error: When Clive Owen is chatting on the internet to who he thinks is Anna, you can see the URL in web browser. The domain used is "www.nopop." It's impossible for the domain to be missing its top-level suffix (eg. .com).
Answer: Anna says that Alice has "had quite a life" (after she read Dan's book that was based on Alice). Presumably Alice has been through difficult situations: abuse, neglect, etc. She considers herself a "nobody" and enjoys lying as a form of control. Which is why she never told Dan her real name, or everything about herself. She could never trust anybody completely. She also says "I'm the one who leaves." She prefers to leave men before they can leave her.