When they are in the bar doing trivia the trivia masters lips are not in sync with the audio while the camera is at the long shot angle.
Near the end after they clean the office and change the plan to put the trivia decorations back up you can see something moving (pole, possibly boom mic) in the window on the right side of the screen through the glass.
During the cleaning montage a boom mic can be seen through the open doors to the office, right hand side of the shot.