When Phil and Jon Stewart are having a meeting, the office's door is open. The next shot when Larry comes, he knocks and opens the door. Phil leaves, walking behind Jon but not only he disappears from the next shot but the door is closed without Larry doing that.
Around 13:20, the camera presents a white blur when Arthur gets up and leaves Larry's office.
Shadow of the boom mic is reflected in the window alongside Brian when he's talking to Hank.
Around 11:56. A boom mic enters the shot on the left side during Jon and Larry's reunion.