Factual error: The movie was meant to be set in Oregon, but it was actually filmed in Shreveport, Louisiana. In the scene that has Tracy leaving the apartment complex where Bafford (Mr. Smith) is, she is worried that she is being chased by a jogger who may possibly be Mekes. In the background, during the shot where the jogger first appears, a brown sign can be seen. These specific signs are unique to Louisiana and describe the history of certain locations, this one obviously being Shreveport.
Continuity mistake: As Tracy Atwood is catapulted from the open van door onto the taxi's windshield, the side view of the taxi shows the side windows have a curtain or black film behind the glass. Immediately after, the next side view shows no curtain or film, and the driver is now visible. Slo-mo is not necessary.
Trivia: At about 1.48, while Mr. Brooks is reading a paper in a diner, the newspaper - USA Today - has only the headlines and first few lines written in English. The rest is in Latin. You can see it on the Bluray disc.
Mr. Brooks: Before I was the Thumb Print Killer, I killed a lot of people, in a lot of different ways.