When Lady Mary - later to be crowned 'Bloody Mary' Tudor - enters her small room at Hatfield House (at 15.15), the beams of light coming in through the window are not parallel, as they would be if they originated from the Sun. Instead they 'fan out', as would result from an electric lamp close to the window.
This is the first episode where Jonathan Rhys Meyers begins to betray his Irish heritage, particularly when he gets angry. Note in particular the pronunciation of "stubborn".