Jess initially pulls up to Calebs house in a black Ford Escape. They drive to Villisca in a black Ford Escape, but once arriving at the murder house, the vehicle changes to a black Ford Edge.
The word "equivalency" is mistakenly (and somewhat ironically) misspelled as "equivelency" on Caleb's High School Equivalency Diploma.
The song "Paper Doll" is played repeatedly throughout the movie, and first heard in the opening scene which takes place in 1912. The song, however, was not written until 1915 (and not recorded until later).