Fridge Brilliance: He is a ghost, which is why we never got to know his name.
Also the reasons why Ruth didn't want to be included in the book.
Fridge Logic: They could have avoided the danger of the writer stumbling onto things, simply by hiring a CIA-friendly author instead.
Funny Moments: As the Ghost is driven to Lang's house, currently surrounded by a bunch of peaceful protesters banging on the car windows, and having just learned that Maddox has turned the book's deadline from a month to two weeks, calls Rick.
The Ghost: Hey Rick, Maddox upped the deadline to two weeks. Thanks a lot for the job. Also, a bunch of peaceful protesters are trying to kill me.
One-Scene Wonder: Lovable old Eli Wallach, in one of his last roles in a feature film, as an unnamed old man the ghost writer questions.
Strawman Has a Point: Adam Lang's defence of the war on terror after the ghost confronts him with the evidence he's found.