During production, Tim Curry was offered the role of the Eighth Doctor in Doctor Who (1996). He was interested in playing the role, but he didn't know how to play the character. One day during filming, Curry approached Paul McGann on how he would play the Eighth Doctor if he was cast. Curry eventually turned down the role because of scheduling conflicts with several movies, and McGann was cast as the Eighth Doctor.
When Charlie Sheen's character Aramis says "See you in Calais", it is a reference to the famous General George S. Patton Jr. quote yelled at Dwight D. Eisenhower out of Patton's hotel window - three hundred years after the film is set.
D'Artagnan is saved from beheading by the other Musketeers, who disguise themselves as a priest and headsman. While this scene is not to be found in the original novel The Three Musketeers, there is a similar scene in the sequel, Twenty Years After, in which the four musketeers attempt to save England's King Charles I by disguising themselves as men working on the execution scaffold.
Cary Elwes was also considered for one of the roles until well into the casting process, and appeared in a pre-production interview from New York's Planet Hollywood with Charlie Sheen and Kiefer Sutherland that was broadcast on E! Network.
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.
A rival TriStar version was also in development at the same time as this film, with star Johnny Depp and director Jeremiah S. Chechik attached. Ultimately, it fell through. Oliver Platt had also been approached to play Porthos in that version as well. Interestingly, Chechik would direct Platt two years later in the film Tall Tale (1995).