Continuity mistake: About where she's heading 5 miles, in one shot Cheryl's (Reese Witherspoon) watch and bracelet are on her left wrist and in one shot they are both on her right wrist. Then throughout the rest of the film, Cheryl's watch and bracelet are on her left.
Continuity mistake: When Thomas first arrives at the Clay Pits, Timothy can be seen with a train of trucks. In the next scene, they have disappeared.
Continuity mistake: When Harper meets Ryan, who's out jogging in the rain, for the second time to recruit him into the CIA, the hood on Ryan's jacket moves between shots, most noticeably in the very close-up shot of his face. (00:12:00)