This episode features Freddie Jones who is one of only two actors (the other being Dudley Sutton) who appeared in both the original Randall and Hopkirk as well as the 2000 remake. Jones was in the episode, "Revenge of the Bog People", aired during the second season of the remake as Caodoc Evans.
The girl with the dog in a minor scene played by Carol Dilworth is the mother of once famous Chesney Hawkes and his song "I am the one and only"
There is a real life Crake Castle, although spelt 'Crayke', in North Yorkshire.