When Faron is viewing an article on the Phoenix Times Herald website (a made up newspaper for the movie), it mentions Phoenix County Sheriff's deputies. Taking place in Phoenix, AZ, it would be Maricopa County. There is no Phoenix County in Arizona. Furthermore, taking place in Phoenix, it is more than likely that the Phoenix Police Department would be handling the case.
When Faron is viewing an article on the Phoenix Times Herald an area code is listed regarding an investigation in Phoenix, AZ. The area code listed is 503, which is not in Arizona but for the northwestern region of Oregon.
When Faron exits the car and approaches the house after the fedora man enters the teacher's home, you can see the shadow of the camera man directly beside hers.