Continuity mistake: Mark is watching Susan get on the helicopter and he hooks his Flight Physician jacket over his finger so it is hanging over his shoulder completely down his back. However, the shot from behind shows the jacket partially draped over his left shoulder - then it goes back to being down his back.
Character mistake: When Dr. Keaton rushes back into the OR to take over from Peter, she moves forward, pushing the door open with her hands. No surgeon would EVER enter an OR this way-it would contaminate her hands. The proper way is to back into the room, keeping one's hands in the air and free.