Visible crew/equipment: A green screen is visible in Agent Weine's glasses when talking to Agent Schrek after they let Alex go during Ms. Lewton's death sequence. (00:58:05)
Visible crew/equipment: When the train breaks Carter's car there is a camera man inside it.
Visible crew/equipment: During the FBI's original investigation, a green screen can be seen in the officers glasses. However, nothing green is in the room. (00:20:50)
Visible crew/equipment: After Alex walks into Ms. Lewton's home before he discovers her blood on the floor, you can see a crewmembers shadow moving on the light brown TV table. (Note the shadow doesn't match Alex's movements).
Answer: It is "And When I Die" performed by Joe 90, based on the Blood Sweat and Tears song. It's available in iTunes.