Visible crew/equipment: In the shot of Rachel driving up the street with Aidan just before they arrive at their new house, the car breaks right in front of the camera for a few seconds. In this shot you can clearly see the camera reflected in the left corner of the car. (00:07:15)
Visible crew/equipment: When Rachel pulls up to the crime scene where Jake was killed, as she gets out of the car you can see a grid of set lights reflected in the car window door. (00:12:30)
Visible crew/equipment: When Rachel starts to climb out of the well water onto the well wall, in the closeup of her left side as she lifts herself out of the water, a long white cord/wire hangs straight down her left side from her shirt to her pants. (01:36:05)
Answer: The deer were attacking the car because Aiden was in the car. Aiden was possed by Samara at the time and Samara makes animals go crazy.