Factual error: In the two execution scenes (attempted with D'Artagnan, rendered moot by suicide with Milady de Winter), they are both clear-headed. In actual antiquity, people would be drugged beforehand both as mercy and to keep them from struggling. Captain Kidd was given rum with something else (sources vary) for example.
Factual error: Not long into the film, D'Artagnan jumps in some hay. There's a flag of the province of Québec (Canada) visible in the background. This film is set in France at a time this flag didn't even exist.
Answer: No. Inigo's sword has a jeweled hilt. D'Artagnan's is not jeweled.