When the plane is hit by machine gun fire one of the engines is shown with the propeller feathered, but as the plane is coming in to crash the propellers for both engines are turning.
Upon arriving back at Trinity College we see Claudia, Nigel, Sydney, and Cate in Sydney's office suite. Sydney signals Claudia it is time to go to a meeting. Very briefly Sydney's arm can be seen reaching out to pull Claudia away to leave the office. After less than a quarter second Sydney is seen standing next to Cate with her arms at her side.