The title of this episode is named for Lord Lovat, The Old Fox, Jamie's grandfather.
Jamie says 'Forever is a very long time', which alludes to the quote 'Never is an awfully long time' from Peter Pan, written by the Scottish author J.M. Barrie.
Young Simon recites lines by Allan Ramsay from 'Lochaber No More'.
Simon says to Lord Lovat 'my cousin is right', referring to Jamie and the Jacobite cause. However, Lovat is Jamie's grandfather, which means that despite the age difference between them, Simon is Jamie's uncle, not cousin.
'The Fox's Lair' is the title of Chapter 40 in Dragonfly in Amber.