Corrected entry: When the Musketeers appear to save D'Artagnan from execution, Porthos says "this axe was a gift to me from the Tzarina of Tokyo." Although this lie is a reference to an earlier outrageous claim that he'd made at their first meeting, it would be impossible for him to make it, since Edo was only renamed Tokyo in 1868, and the film takes place some two hundred years before.
Corrected entry: When all of the Musketeers run down from the stands near the end of the film, right before Athos yells "Save the King!", they all throw off their cloaks, revealing their Musketeer tunics. However, in the angled shots from behind the Musketeers facing the guards, there is a Musketeer in the bottom right corner who does not get his cloak off.
Corrected entry: Rochefort is wearing an eyepatch, which means he has no stereoscopic vision. It's hard to imagine that he could be any good at swordplay because he is not able to determine distances of objects, especially fast moving swords.
Corrected entry: When the Musketeers are disbanded, they throw their swords in a pile on the ground, and their tunics on the fire. However, some of them get a little bit mixed up and throw their tunics on the sword pile.
Corrected entry: One of the Musketeers jovially offers to celebrate with a bottle of champagne but champagne hadn't been invented then.
Corrected entry: Near the beginning when the musketeers are disbanded, they all throw their blue uniforms on the fire and toss their swords in a pile. Before the big end fight at the king's birthday, the three musketeers ride around and rally the others. Suddenly, all the musketeers have their blue uniforms and swords stashed and they get them out to go to the fight.