The Shakespeare Code it is one of his own from "Henry V", which was probably written in early 1599. When questioning Shakespeare about witches, Martha remarks that he has written about witches; a reference to "Macbeth", which Shakespeare denies. At the time in which the episode is set, Shakespeare had yet to write "Macbeth" or "Hamlet", which prominently feature the paranormal, such as witches and ghosts. There are numerous other allusions to Shakespeare's plays. Just before the Doctor steps out of the TARDIS, he exclaims "Brave new world", from Act V Scene I of "The Tempest". In an early scene a sign is
Never Take Sweets from a Stranger Take Sweets from a Stranger" took place in Burnham and Black Park in Wexham, Buckinghamshire. Black Park was featured in numerous Hammer productions due to its atmospheric appearance on film and its proximity to Hammer's Bray Studios base. Aside from the alternative title, there is some mild swearing in the original British 'Sweets' prints. It features a line from Patrick Allen's character around the ten minute mark: "If he touched her, I swear I'll kill the bastard." In the US 'Candy' prints (and the 2010 Icons of Suspense DVD), the word 'swine' is used instead on the audio instead, also