In the doctors quarters, in the room with the window, there is a radio on top of a barrel. When you activate it, it just sound like some random noises, but if you listen very carefully, it sais "Im doctor.Max" in a very echo-like vioce.
Also, I dont think the hanging man hung himself because there is a parachute hanging off the roof and a cloth covered in blood on the ground. He must've parachuted down and gotten caught and made it look like he hung himself.