(Prompted specifically by How did Chell end up at Aperture?, but this is by no means the first time this has happened.)
I am concerned that sometimes questions get closed inappropriately, particularly as duplicate, when the questions are asking similar, but different things. If I had 3000 rep, I could cast a re-open vote, but I do not. What is the recommended mechanism for drawing attention to questions if we believe they have been inappropriately or prematurely closed? I usually leave a comment on the question itself, but this does not in general draw attention of those previously uninvolved who may be qualified to make a judgement.