The Three Musketeers

The sword fights were with rapiers, which do not have sharp edges and yet D'Artagnan cut his hand while holding Rochefort's blade.

Early scenes had fighters slashing with their rapiers, which are only used for stabbing.

Rapiers could be used for slashing depending on the on the sword smith who created the sword.

In writing, depending on the author, they were either described as rapiers or cut and thrust swords.

The Spire on top of Notre Dame which impales one of the airships, was not built until the 1800s.

The Church was restored starting in 1845 lasting 23 years, it was during this time that the Spire was added to the building.

Buttercup's (the horse) spots start to run when he starts to sweat.

Although the airships are spectacular, in reality they would never get off the ground due to their weight.

Airships had to be of very light construction to fly (no cannons, etc.

) The airships in the film were lifted by streamlined hot air balloons, so fire did not present the issues that Hydrogen would have.

The Cardinal and Milady are having a discussion in the Hall of Mirrors located in the Palace of Versailles.

Versailles is outside of Paris and the hall of mirrors wasn't constructed until the third building campaign of the palace starting in 1678 by King Louis XIV.

During the vault scene, when the explosive charge on top of the lamp is lit, an electronic candle consisting of what appears to be many LEDs can be seen.

When the airship first appears, she does so flying low coming from behind the palace.

Yet, in the panoramic view before Buckingham's arrival we can see the whole horizon and almost no clouds, and the airship is nowhere to be seen, when is obvious we could see her approaching.

When Athos and D'Artagnan first cross paths in the market and talk, the position of D'Artagnan's hat changes repeatedly between shots.

In the ball scene, when the musicians are tuning their instruments, they are using Tourte bows, a style of bow that was not created until the late 1700s, significantly after the movie takes place.

During Rochefort and D'artagnans' final duel, Rochefort's main gauche (dagger), worn on his back, disappears and then reappears in its sheath before he is ever seen drawing it.

For clarification, some swords were known as "thrust and cut" weapons.

However, the swords used in the film, with the exception of Porthos, are designed purely for thrusting.

The sharpened edges on the blades that appear in certain scenes were designed historically to help the blade get through tough material (like leather) during the thrust.

These facts result in some rather direct mistakes in sword play in the film.

In particular, the final duel between Rochefort and D'artagnan shows many errors.

For a key example, during this duel Rochefort attempts several times to attack D'artagnan by sweeping his rapier in a downward or sideways ark as if to slash him.

In reality, the swords used lack both the weight and rigidity to inflict anymore than a superficial surface wound.

As the scene transitions from Meung Sur Loire to Paris, the map zooms from Meung Sur Loire to Paris.

Based on the orientation of Notre Dame Cathedral, Meung Sur Loire would need to be to the north of Paris, when it fact it is to the south, though this map be a "deliberate" error by the filmmakers, since the alignment of the Seine in the map bears little to no resemblance to the actual geography of the Seine in Paris.

When D'Artagnan is shown entering Paris, he crosses a bridge over the Seine to the rear (south) of Notre Dame Cathedral.

In the movie, the Seine appears to be extremely wide at this point (100's of yards on either side of Ile Saint-Louis - the island to the south of Notre Dame).

In reality, the Seine is <500m wide at this point, and the islands are the majority of the width.

The two water channels are extremely narrow to either side of the islands.

When the Cardinal's Guards chase after Constance at the port of Calais, one of their hats blows off.

Milady discovers the razor-sharp, high-tension wires protecting the jewels by throwing a ribbon in the air that is cut in multiple pieces.

As she does acrobat movements to work around the wires, she also cuts pieces off her own dress.

As she reaches the end, there are no pieces on the floor behind her.