- 'Taylor, Robert' and Ricardo Montalban and 'Greenstreet, Sidney' were originally cast as Athos, Aramis and Richelieu.
- Lana Turner originally accepted a studio suspension in preference to playing Lady de Winter because she considered Milady a secondary character.
- Richelieu is referred to as prime minister and almost all traces of him being a cardinal or a man of the church have been removed (although Jean Heremans is still credited as "Cardinal Guard").
- Because of feared pressure from church groups, M-G-M changed Richelieu from a cardinal to a prime minister, even though his true clerical office had been shown in many other films without any repercussions.
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