Inside Info?

Does being a fictional TV character give you access to inside information about the future plot direction of other TV shows?

During last night's 30 Rock finale, Liz Lemon, trying to talk Jack Donaghy out of killing himself (which he wasn't going to do anyway), yells to him: "Don't you want to know how Mad Men ends? Don goes to work for Peggy!" However, it was kind of hard to hear this because the background music was a little too foreground (a problem with a lot of TV shows), and at that point Liz was sort of shrieking; I had to go back and listen to the line three or four more times to decipher exactly what she was saying.

But what's interesting about the scenario Liz described (to me, anyway) is that it's been in my mind for some time as a possible ending for Mad Men. It's not entirely outside the realm of possibility (though I acknowledge that a great many things would have to happen), and it would probably be about the worst possible situation for someone like Don Draper.

Don't expect Matthew Weiner to have any sort of comment on this...