In reality, Kate Middleton never met Diana. According to most accounts, including Kate's engagement interview, she had not met Prince William before they attended St. Andrews, but according to Vanity Fair they may have first met in the summer of 1999 through friends.
Prince William's girlfriend Lola Airedale-Cavendish-Kincaid is a fictional character invented for the series but is believed to be loosely based on Carly Massy-Birch, who was briefly involved with William at St Andrews.
'Raisin Weekend' is a real tradition at the University of St. Andrews, during which there really is a shaving cream fight on St. Salvador's Quad.
Eve Best, who plays Kate Middleton's mum, played Wallis Simpson, the wife of the Duke of Windsor, in The King's Speech (2010).