When the Palmer leaves the room after talking with Sherry, the frame on the wall is opened as well as the safe. When he leaves though, outside, from the mirror reflection you see the frame is closed.
When Jack tried to call the safe-house, he said that no one was picking up. Previously, when Tony tried to call the house, he said the phone wasn't even ringing, presumably because the phone-line was cut.
Continuity error when Jack and Nina are on the escalator at the California Plaza: in the medium shots, a man and a woman are seen a few steps in front of them. In the long shot, Jack and Nina are the only ones on the escalator.
When George Mason is asking Tony Almeida if they got anything back from forensics, you can see a camera over his left shoulder.