When Bartlet storms out of The Oval Office, his "mark" is visible as a piece of black tape on the ground where he walks toward and stands.
At around 15:12 Josh looks directly to the camera, while saying "if you're saying there's a full-blown nomination...".
Leo McGarry tells President Bartlet, "K2 isn't in Pakistan, you only think it is." K2 actually is partly in Pakistan, on the border with China.