The line Shakespeare is working on in Greene's office that starts with 'There is no terror in your threats' is from 'Julius Caesar, Act 4 Scene 3.
The title is taken from 'Twelfth Night', Act 1 Scene 1.
The number of viewers slid back to 1,240,000 for this edition of the show dropping Upstart Crow down to 28th in the BBC Two rankings for the period 2nd October 2017 - 8th October 2017.