 On the surgeons tray of equipment, you can see a red rubber ball.  The object was placed on there in reference to  Terry Gilliam (qv)s _Brazil (1985)_ (qv), where the end sequence  of the film has a tray of torture devices, which contains a rubber  ball along with it. Not many people notice the rubber ball sitting  there and the director added it to the surgeons tray because its  incongruity amused him.