Sandra spoke abut the role of the director, during production. Thedirectors responsibility lies in recognising his or her vision for the film. On the day of production, they are largely concerned with dealing with the actors, advising them on their characters and blocking, as well as making sure they are comfortable and happy.
Another great point made by Sandra, is the importance of a Plan B. This is a plan which has the sho list planned out in order of importance to least important in terms of lighting and scene groupings for a particular character. By doing this, if there is a problem during the day of production (for example, an actor is late), production can move forward by referencing the Plan B.