When Cyrus lady love disappears he plays the song "Ain't no sunshine when she's gone" The song was used during Notting Hill which features Elizabeth Hurleys ex Hugh Grant.
When discussing the murder of Dominique Stuart and the disappearance of Violet Cyrus and Liam mention King John of England and Herod the Great as murders. As members of the royal family they are descendants of both men. In real life Jake Maskall and William Moseley are likely descendants of both King John and Herod the Great.