Visible crew/equipment: When Frankie (Patricia Arquette) returns to work after receiving the hand wounds, something catches her attention and she goes to the window to look at a mysterious woman. At one point, a group of doves burst from the ground to the right of the woman (from Frankie's view). if you look directly where the dove's come from, you can see the travelling cage they are released from. if you look a little more to the side, you can see a stage hand laying on the ground, shaking the cage so the doves will come out.
Trivia: After Frankie tears up the apartment, possessed by the priest, she goes to the bed and levitates in a cruciform position. During this scene, there is a quick, sweeping shot of the wall and, if you watch it in slow motion, you can see a wall of boxes of Ritz crackers. This is either an obvious endorsement or some kind of inside joke.