As I have mentioned before, friends of mine who are musical directors have suggested to me that the final few notes in that song are an almost perfect storm of complexity and apparently, it is difficult to hit the final note with any certainty that you are staying in pitch (does that make sense, it sounded so much better, pardon the pun when I was having it explained to me).
Even from a layman's perspective, it's a weird sounding ending.
http://www.broadwayworld.com/board/readmessage.cfm?thread=972787#3631451
http://www.broadwayworld.com/board/readmessage.cfm?thread=963561#3533883
http://www.broadwayworld.com/board/readmessage.cfm?thread=955158#3440952
http://www.broadwayworld.com/board/readmessage.cfm?thread=954269#3427915
http://www.broadwayworld.com/board/readmessage.cfm?thread=955012#3441622
http://www.broadwayworld.com/board/readmessage.cfm?thread=954344#3428699