Visible crew/equipment: On some shots which look back at Ray when he's driving his pickup, it can be clearly seen at the bottom of the picture that the front wheels of the pickup are sitting on a trailer, which is itself being towed by the camera vehicle.
Visible crew/equipment: Ray and Annie are talking about going to Boston and the camera is tracking through their home. The camera is reflected in a picture hanging on a wall in the kitchen as the shot passes it.
Answer: It was actually his own voice (Kevin Costner) that sent him on the journey. At the end of the movie there's even the part where Ray is recalling the voices he heard and turned to Shoeless Joe Jackson and says, "It was you". At which point Joe Jackson turns around and says, "No Ray. It was you".