Rock Hudson and guest star Roddy McDowall (Jamie McMillan) were frequent co-stars in this decade. They previously worked together in Pretty Maids All in a Row (1971), and later appeared together in the film Embryo (1976) and the miniseries The Martian Chronicles (1980).
The castle set is the one used in the 1967 film "Camelot".
Rock Hudson and guest star John McLiam (Ramsey) had just appeared together in the Western film Showdown (1973), released in June of 1973.