Revealing mistake: In the fight scene right after the guards interrupt the duel, Porthos breaks his opponent's sword with a 3 bladed knife and then he throws a balled string which wraps around the guard's head. When the scene shifts to the guard's close up you can see the guard throw the wrap around ball himself. (00:28:55)
Revealing mistake: When D'Artagnan is in jail, right after he says "if you give me back my father's sword I'll cut your heart out", when Rochefort hits him in the back of the head you can see the sword handle never touches him. (00:33:15)
Answer: No. Inigo's sword has a jeweled hilt. D'Artagnan's is not jeweled.