30 Rock: "Flu Shot"

Nathan Rabin is off at Sundance right now, whereas I am not, so I'm filling him for him tonight on 30 Rock. Don't worry, he'll be back next week, probably with lots of swag and stories of cuddling with Robert Redford in front of a roaring fire in charming wool sweaters.
For me, there are two types of episodes of 30 Rock: the really really good ones, where all the parts come together to make a wonderful whole, and the pretty good ones, where there memorable jokes and lines are all there, but put all together create a kind of uneven episode. That struck me as tonight's type of episode.
Liz, when offered one of a few Dr. Spaceman-administered flu shots, refused on the grounds that it wouldn't be fair to the cast and staff of "TGS," who wouldn't receive one. Jack found this senseless. I normally love it when Jack encourages Liz to embrace her elitism (and when she gives in) but it didn't have the same hilarity as it usually does, maybe because we didn't see enough of Liz's guilty white liberal side. Except, of course, when she and Jack pondered aloud why it sounds so wrong for a white person to call a Puerto Rican person "a Puerto Rican." "That does not sound right."
Of course, when Liz discovered that she could after all make it to her vacation destination, St. Bartlebys, where you can wear a "tankort" and sport black socks with sandals and have sandwiches brought to you by a turtle while you take on an island lover, all her morals went out the window and she had to pretend that she hadn't gotten the shot while avoiding her sick colleagues. For some reason the scene with them as zombies didn't really work for me, except when she smashed a frame over Pete's head (who it seems we've seen very little of this season) and he cried "Why?!"
I wouldn't have minded seeing more of Jenna and Tracy's day together, as they attempted to make all their sick colleagues feel better. "I had a brainstorm, but it was a bad one. Jenna had to put my mouthguard in." Are the two of them, together or separate, ever not funny on 30 Rock? I'd rather have more of them than sick Kenneth. When Liz said that she didn't need to see a montage of their shopping trip, I kind of disagreed.