- Shot at the same time as Four Musketeers, The (1974), and resulted in a lawsuit. See Four Musketeers, The (1974).
- Originally conceived as a Beatles vehicle by veteran Beatle director Richard Lester.
- Jean-Pierre Cassel's (Louis XIII) voice is overdubbed by Richard Briers.
- The Duke of Buckingham's billiard room and the long hall behind it at his English estate is a leftover set from Patton (1970), it is also seen in Four Musketeers, The (1974), where Milady and Buckingham speak about American Indians and also serves as a set of rooms in _Return Of The Musketeers, The (1989)_ for a different character in France some 10 years after the action of the first two films. Also, the gown worn by Faye Dunaway during the Ball sequence at the end, is also the main gown worn by Jenny Agutter in _Man In The Iron Mask, The (1977)_ .
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