There is incidental mention of the "sweating sickness". In the late 1400s and early 1500s, England and Europe had multiple outbreaks of the 'sweating sickness'. It caused fever and severe aches and profuse sweating and could kill within hours of the first symptoms. After 1555 the disease disappeared, and modern scientists have no clue what it was.
Nathaniel Parker and Melanie Hill both appeared in the 2007 film Stardust (2007). They played Dunstan Thorn and Ditchwater Sal respectively.
Charlene McKenna (Lamia) has worked with two actors who have played King Arthur in separate projects: Bradley James in Merlin (2008) and also Liam Garrigan in the TV series Raw (2008), who would later play King Arthur in the TV series Once Upon a Time (2011).