One of the previous Musketeer films was The Fifth Musketeer (1979), loosely based on the final novel, The Vicomte of Bragelonne, AKA The Man in the Iron Mask. In that film, the roles played by Charlie Sheen (Aramis) and Kiefer Sutherland (Athos) were played by Lloyd Bridges and José Ferrer. Sutherland appeared with Miguel Ferrer in Twin Peaks: Fire Walk with Me (1992), and Sheen appeared with both Lloyd Bridges and Miguel Ferrer in Hot Shots! Part Deux (1993). Chris O'Donnell worked with Miguel Ferrer on NCIS: Los Angeles (2009).
Some sequences were shot in Cornwall, England. A small woods called Golitha Falls was used in one sequence when the musketeers are being pursued by guards. The small harbour village of Charlestown is home to the galleon that was used in a night-shoot.
Kiefer Sutherland, Chris O'Donnell and Oliver Platt all endured six weeks of fencing and riding lessons. Charlie Sheen missed out on all this, as he was then embroiled in the filming of Hot Shots! Part Deux (1993).
The copyright date (in Roman numerals) is incorrect in the end credits (it is missing an 'M'). The film shows (c) MCXCIII (1193) when it should read (c) MCMXCIII (1993).