Subway Hero - S2-E12
Continuity mistake: As Liz is talking to Dennis in the subway, he is leaning against one of the steel pillars with his left arm near to the location of his head. If you notice his arm is being supported by the pillar but his hand is not. In the shots of Liz whilst Dennis is leaning against the pillar, you cannot see his hand and the location of it should be covering part of his forehead.
Continuity mistake: When Kenneth is talking to Pete about his reference to a page in the Beijing Olympics, there is a bow and arrow that appears suddenly on the wall behind Pete that wasn't there in previous shots.
Episode 210 - S2-E10
Continuity mistake: In the scene where Tracy is trying to get Kenneth to try coffee, watch the foam on the coffee. The foam decreases and increases throughout the scene.
Answer: There's probably lots of reasons why Liz stays - money, lack of other job prospects and so on. The reality is, if she left, that would adversely affect the story line and the comedy within it. Tina Fey was one of the stars, and her character is an integral part of the show.
raywest