Eliza Birch: Did you feel bad for that deer when you shot it?
Ralph Dover: Do you feel bad for cows when you go into McDonalds?
Detective Loki: Alex Jones, unfortunately has the I.Q. of a 10 year-old. There's no way someone with the I.Q. of a 10 year-old could abduct 2 girls in broad daylight and then... somehow dissppear.
Keller Dover: Well, maybe he wasn't on his own. How could he drive an RV if he has an I.Q. of a 10 year-old?
Keller Dover: Someone has to make him talk or they're gonna die.
Detective Loki: Just let me do my job.
Captain Richard O'Malley: You think this is gonna lead you to the bodies? Cause I sure as shit don't.
Detective Loki: Do me a favor, captain. Go fuck yourself.
Keller Dover: You wasted your time... you wasted your time following me. You let that happen.
Keller Dover: He's not a person anymore. No, he stopped being a person when he took our daughters.
Answer: Yes, it was part of Jake Gyllenhaal's contributions to the character to express his bottled-up emotions and inner conflict.