During the attack from nerve gas that has permeated most areas of the CTU compound Chloe says the gas must have a corrosive agent in it because the seals are breaking down around the doors to rooms still protected. However Jack is able to move through the gas simply by holding his breath without being affected by the corrosive agent in the gas.
When Karen is talking to her partner in the car, he says something to her about "all the protocols will go through me". Then, Karen says, "Good," but it is obvious that her lips are not moving at all as she turns away.
Chloe calls Barry a "shrink", a slang, informal term for a psychiatrist. Barry is a psychologist, not a Psychiatrist.