Visible crew/equipment: After Paulie gets shot there's a reflection of a cameraman in the small triangular side window of the car. (00:55:10)
Visible crew/equipment: During the meeting between the Corleone family and Sollozzo to discuss drug dealing you can see a boom microphone reflected in the glass window when Don Corleone stands up to pour Sollozzo a drink, it can be seen moving around. A little later in the same scene when Don rejects Sollozzo's offer you can see a crew member reflected in the same set of window's moving around (above Sonny's head). (00:37:20 - 00:38:44)
Chosen answer: The mattress montage music is called "This Loneliness." It is written and performed by F.F.C's father.