Continuity: In the scene in the park where Frank is hiding behind trees while Laurel times him, Frank stands three times by a black car. The license plate on that car changes from California to Manitoba and back to California.
Errors in geography: The supposed Buffalo train station is full of Via Rail Canada signs, but nary an Amtrak sign, even though we hear an Amtrak train announcement on the soundtrack.
Factual errors: At the airport, personnel checking boarding tickets and screening bags wear generic patches saying "Airport Security." In fact, this would be done by TSA personnel in their recognizable uniforms.
Continuity: In the scene where Frank tells Tom his occupation in the toll booth, Tom's hair alternates between being neatly parted and windswept several times.
Errors in geography: When Frank and Laurel are sitting in the mall (food court), addressing envelopes to the next of kin he killed 'wrong' , we see a store sign in the background, Telus. A telecommunications company based in Canada, which does NOT serve the US, let alone San Francisco.
Factual errors: The story that Frank tells regarding the assassination of William McKinley is incorrect. President McKinley was indeed assassinated in Buffalo as stated, but the rest of the story regarding the shooting and the search for the bullet in his body actually refers to the facts surrounding the death of President James A. Garfield.