As The Doctor is talking to Rosanna by the throne, the orb on the right arm becomes open.
(Around 29 minutes) The Doctor's hands are together in shots from the front but his right hand is on the orb in the over the shoulder shot.
As Rory (using a wooden broom) is fighting Francesco (using a sword) the sound effect is of metal on metal.
Although The Doctor never tells Rosanna his name when they first meet in her throne room, she then calls him "Doctor".
The TARDIS translates everyone's speech from 16th-century Italian to 21st-century English. However, several times The Doctor is called "signor".