So, what's the problem? Here's the problem. Danny starts describing Liz to Jack, using veiled terms (because he's too much of a gentleman to kiss and tell - swoon!) and it becomes more and more clear that the lady-friend is Liz. Midway through his explanation, I thought to myself: "Oh, it's Liz! Wait, no, he would never go for a girl like her."
I know - what am I thinking?! Of course he would go for her - she's sexy, smart, and hilarious! But that moment of doubt, without my even realizing it, means that the smart writing and impressive characterization of Liz Lemon has overridden the visual part of my brain, telling me that Liz is, in fact, unattractive. This may be a failure for my eyes, but it's a triumph for the writing of 30 Rock. All I can say is: well played.
Anyway, Jack convinces Danny to dump Liz by pretending to be in love with Liz himself! Danny, naive fool that he is, believes this, and chivalrously ends his relationship with Liz so the man who loves her can find her. Man - when will this guy be any less than perfect?
There was also a weird subplot with Jenna learning to accept that she's getting older, and age gracefully, and a nonsensical bet wherein Jenna reveals her true age only if Liz reveals her secret, which goes by the code name "Tom Selleck". Shocker - it's a mustache.
You may have gotten me this week, 30 Rock, but look out - this active viewer doesn't accept defeat that easily!