 When Caligula and Nerva walk down the path to Tiberiuss pool, we    can hear people being tortured behind a curtain, which Caligula    looks through at one point. The fragments of people being tortured    several scenes later were meant to be intercut with the scene of    Caligula and Nerva in the hall. Also, several scenes later, we see    bodies being taken off crosses and servants clearing the pathway.    These were meant to act as establishing shots for the scene in the    hall.  