If nobody was in the room with Kane when he died (Nurse was clearly in another room.), who hear him mumble "Rosebud"?
If nobody was in the room with Kane when he died (Nurse was clearly in another room.), who hear him mumble "Rosebud"? Ummm, the soundman monitoring the microphone on the boom over Kane's head just out of the shot? <[8*)
Then, maybe the nurse had really good ears.