Continuity mistake: At the very beginning of the film where we see Norrington walk up to the young Elizabeth at the front of the ship, the bow on his black hat is blowing in the sea wind, yet when he stops to talk to Elizabeth it is no longer blowing, then when he finishes talking to her, it is back blowing in the wind. (00:01:25)
Continuity mistake: At the beginning of the film when the young Elizabeth wakes up Will, then he faints, his head changes position between shots from being pointed slightly up, to resting on his shoulder. Also before he wakes up, his hand's distance from his head changes between shots. (00:03:35)
Continuity mistake: The pirates are running up the path towards the Governor's house. In her close-up, Elizabeth is looking down on them from the ledge outside her bedroom window, with the double full length doors. The camera pans the house after the pirates open the gate and Elizabeth is not seen outside any of the upper window ledges. (00:31:50)
Continuity mistake: Jack says, "That is a wonderful trick..." and hanging on the wall over the chair are a saw and a semi-circular tool and the saw lies over the tool. Later Jack falls when freeing himself from the sword embedded in the rafter, he stands up and climbs onto the cart again. Behind him are the saw and semi-circular tool, but the tool is over the saw now. Then later when Norrington's men shake the door to try to enter, the saw lies over the tool again. (00:24:00 - 00:25:45)
Continuity mistake: Before Elizabeth's blood ritual, Jack is rowing the boat into the cave and Will is holding the pole with the attached lantern. As Jack says, "Any man who falls behind, is left behind," Will is holding the pole with his left hand high up on the pole and his right down below. In the next shot, Will says, "No heroes amongst thieves," and Will's right hand is now high up on the pole. (01:09:10)
Audio problem: After Jack saves Elizabeth at the beginning of the movie, Norrington is searching his weapons. As he takes out Jack's compass he opens it and in the next shot you can hear the clicking of the closing compass although the compass is still open.
Continuity mistake: At the end when Jack tosses the medallion to Will, Elizabeth is running towards them. It shows that she reached a certain point before he tossed the medallion. But when it cuts back to Elizabeth she is running the same space again. (02:00:00)
Continuity mistake: Aboard the Black Pearl, in the Captain's stateroom, when Jack is speaking with Barbossa, Barbossa's buckle moves up and down between all the close-ups and wide shots. (01:19:45)
Continuity mistake: Young Elizabeth's individual hair curls differ in consecutive shots early in the film. They vary from looser, tighter, shorter and longer, as well as the hair that is pulled up. When adult Elizabeth's hair is done up in curls, they change significantly in consecutive shots as well. For instance at the fort, in the front close-up, the shorter curl behind her right ear is actually GONE, yet it's back in all the other shots. (00:01:15 - 00:10:50)
Continuity mistake: After the downing of the square rigged mast aboard the Interceptor, Jack spots the monkey running across it to the Black Pearl and he starts to follow. As Jack runs toward the mast in this shot, we see the broken end of the mast, rigging and sail that is lying at the Interceptor's rail. In the next shot, on Elizabeth's right the broken mast is seen with its rigging on it. The rigging is lying very differently on the mast in this shot than in the previous shot with Jack. (01:29:25)
Audio problem: Just after Gibbs tells Will the story about Jack roping a couple of sea turtles, Jack yells out to the crew, "Let go the anchor." We hear on the audio some of the crew respond, "Ahoy Captain aye." The Region 1 DVD subtitles say, "Aye Captain aye." Yet, when you look at two crewmen's lips, it looks like something else. It possibly could be, "Let go the anchor aye." Either way, their lips do not match the audio. (01:07:40)
Revealing mistake: After Jack says, "Ta," he's about to leave, but Will throws the sword into the door, to block the latch. As Will starts to toss his sword, it can be seen that the sword never leaves his hand, but his arm moves downward with the sword in hand. The next shot is a close-up of the swaying sword embedded in the door. Obviously, Bloom does not make that throw towards Depp. (00:23:40)
Factual error: During the attack on Port Royal, at the beginning of the movie, the guns on the Black Pearl are firing at a far greater elevation than they would have been able to at the time.
Other mistake: Translate problem - only in Hungarian version. In the scene, when Jack and Will are fighting, the blacksmith hit Jack from behind. Captain Norrington arrives, and say: Szép munka, Mr. Swan. (Good work, Mr. Swan.) The blacksmith's name is Brown.
Continuity mistake: When Elizabeth stabs Barbossa, the amount of blood on the knife changes between shots. (00:56:00)
Continuity mistake: Between the two shots of Pintel and Raggeti's cannon, the position of the cutlery around the porthole changes entirely.
Continuity mistake: As Jack and Will are walking under water, holding the boat over their heads, in the interior shot, when the camera pans into the water, Will's right sleeve is covering his right arm, but in the wide shot, Will's right sleeve is rolled up to his elbow. (00:45:25)
Continuity mistake: Jack tosses the medallion to Will. After a shot of Will's hand catching it and Jack's reaction, in the front shot of Barbossa as he pulls out his gun, the leather strap is slung across his chest high up near his neck with the buckle at his lower left side. Yet in the close-up when he reveals the wound, the leather strap is lower on his chest and the buckle is now higher up at his right side. (02:00:50)
Revealing mistake: The cannonballs are solid balls and not self-exploding cannonballs (as can be seen from the handling on board of the Pearl). As such they cannot explode when they hit a target. Even if they were self-exploding cannonballs, they would simply explode and not cause yellowish fire flares around them. The type of fire that is seen after impact comes from a liquid, not anything made of powder (particularly noticeable with the cannonball that hits the prison that lets the prisoners escape).
Factual error: The British warships in the film - and in the whole series, for that matter - are painted in a livery far too modern for the period in which the film is evidently set. The "Golden Age of Piracy," during which the movie takes place, occurred in the early 1700s, but the Royal Navy did not begin using the yellow-and-black "Nelson Chequer" on its vessels until the Battle of Trafalgar in 1805. Even if the film were actually set in the later period, there would still be an inaccuracy in that the Marines' headwear would be incorrect - they transitioned from the tricorne to a round hat in 1802.
Answer: The curse needs the blood of everybody who took a coin from the chest. All the other pirates have already contributed so, as the movie opens, the only blood needed is Will's, substituting for his father. During the finale of the movie, Jack takes a coin from the chest, adding himself to the curse, so his blood is now required as well as Will's.
Tailkinker ★
But I didn't see any blood on the coins, and none of the pirates cut themselves, even before Will became part of the mix.
Yes, the other pirates did cut themselves before Will came into it, off-screen. The lack of blood on the coins can simply be explained as most of it dripping to the bottom of the chest, it being washed away by storms blown into the cave, or by the fact that they didn't drop that much blood on it in the first place.
When they had Elizabeth they believed she was Bill Turner's daughter, but they all thought the curse had failed, none of them had cut themselves so it makes zero sense.
They had been collecting back the coins for years. During that time they repaid their own blood. All they needed was the last coin and the blood of Bill Turner to break the spell.
lionhead