In Sam's reverie 'Dog' is likely distracted by a crew member. Dog also looks up at the boom. It can be assumed because Amelia has not yet entered the scene.
In the morgue, Dean holds up the hand of the dead body to show the wedding ring. When medical examiner staff receive a body they remove all of the clothing and personal effects so an autopsy can be performed. Since the clothing had been removed from the body, the staff would have removed the wedding ring also.
Amelia gets the call at the end of the episode about her husband still being alive. In real life, two representatives from the military would have visited her in person to hand her this news.