Lionheart's tomb is an actual monument in Kensal Green Cemetery, London. It belongs to the Sievier family, and shows the sculpted figures of a seated man, one hand placed on the head a woman kneeling in adoration, while the other holds the Bible, its pages opened to a passage in the Book of Luke. This monument was altered for the film by plaster masks of Price and Rigg substituting for the statue's real ones, the Bible became a volume of Shakespeare and there is a suitable engraving at the front with Lionheart's name and dates.
Vincent Price fell in love with and married actress Coral Browne following production,which lasted from July 10-August 17, 1972. The film was released after Vincent Price's March 18, 1973 appearance as the subject of "This is Your Life", his last public appearance with second wife Mary, who knew nothing yet about his affair with Coral, set up by Diana Rigg, who noticed the chemistry between the two.
The name of Diana Rigg's character is derived from that of Edwina Booth, daughter of actor Edwin Booth (1833-1893), considered by many to be the greatest Shakespearean actor of his day - and the brother of John Wilkes Booth, the most infamous actor of his day.
The full name of Vincent Price's character, according to his memorial, is Edward Kendal Sheridan Lionheart. "Sheridan" is probably a reference to the eighteenth-century playwright and manager Richard B. Sheridan, or his actor-manager father, Thomas Sheridan.
The picture of the handsome Elizabethan young man in black cape and white tights shown during the opening credits, and later used as the model for the film's Critic's Circle Award is a painting entitled Young Man Among Roses by Nicholas Hilliard (1547-1619), and is in the collection of the Victoria & Albert Museum, London.