Stone refers to the police artist's sketch as a mugshot. A mugshot is a photograph of someone after they have been arrested.
During the Church service scene many of the parishioners leaving the church look into the camera.
Boom shadow visible on the left hand side throughout the scenes in Stone's office both with Lenny and then Father Driscoll.
Martin Novak is a Catholic, yet a close-up of his massive Holy Bible shows it is an Authorized King James Version, a Protestant translation with only 66 books. Catholic Bibles contain 73 books and deuterocanonical additions to Esther and Daniel.