Goofs for
The Three Musketeers (1973) More at IMDbPro »

• Continuity: In some stunts, the musketeers are seen for short spans of time with no rapiers - their hands are empty, as are their scabbards, while before and after they wield their swords. (One notable example is d'Artagnan climbing the walls of the palace near the climax.)
  
  
• Continuity: When Athos is hitting a Guard with a stick in the climatic scene at the palace, in one shot his sling falls off, but in the very next shot it is back on again.
  
  
• Factual errors: When M. Bonancieux is using his periscope in the palace gardens, his view is shown as being upside-down. In fact a periscope does not invert the image.
  
  

• Revealing mistakes: Just before the fight with the cardinals' guards, Porthos picks up large rock to use as a weapon. As he examines the rock, you can see that it's artificial, because he exposes the mold line.
  
  
• Revealing mistakes: During the first duel with the Cardinal's guards that takes place in the Nunnery - Frank Finlay goes behind a piece of laundry to hide from and surprise his opponent. From off-screen we hear a crew member yell "FRANK!" Then Finlay comes out from behind the laundry to hit his mark and finish the scene.
  
  
• Continuity: During the fight in the laundry, one of the Swiss Guard threatens Athos with a pole. The Guardsman is bare-headed but a moment later, when he attacks, he is wearing his hat.
  
  
• Errors made by characters (possibly deliberate errors by the filmmakers): When in the beginning of the first fight in the Carmalite convent, D'Artagnan shouts at Porthos for a sword, calling him Aramis.
  
  

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