A poster notes Tabatha Fortis's lecture would be at 9pm. But she has given most of her lecture before leaving, which causes the call to Toby, who receives it before the President's 9pm press conference.
When Toby says that the North Koreans have 900,000 soldiers in the Demilitarized Zone (DMZ) between North and South Korea, he means north of the DMZ. By definition, the Demilitarized Zone has no soldiers (or land mines) in it.
When Ainsley leaves Toby's office, her flip-flops can be heard. No shoes appropriate to that environment and outfit would make that noise. Actors often wear flip-flops on set when their feet will not be on camera.
When briefing on the President's background, C.J. Cregg says that he was a tenured professor at Dartmouth University. The proper name of the institution is Dartmouth College.