Continuity mistake: The position of Barbossa's white shirt collar varies within wide and close-up shots, during the first blood ritual with Elizabeth. (01:10:05 - 01:14:40)
Continuity mistake: Barbossa shoots Pintel and a hole appears in his shirt. This hole soon vanishes never to be seen again. (01:11:00)
Continuity mistake: Barbossa rips the chain and medallion off Elizabeth's neck, puts it into her palm, then cuts her hand. He takes her hand in his and he turns hers over so it's palm down. The chain can be seen in the close-up and wide shot, dangling down between her fingers and the chain is NOT clasped shut. In the next close-up of the chain and medallion falling into the chest, the chain IS clasped shut. (01:11:55)
Continuity mistake: After cutting Elizabeth's hand, Barbossa says, "Waste not," and there's a wide back shot of the two of them, Barbossa is holding the knife in his right hand, and the edge of the blade does not have blood on it. In the very next shot, a close-up of the medallion falling from Elizabeth's hand, the edge of the blade now has blood on it. In a later shot when Barbossa looks at the blade, there is blood on both sides. (01:12:15)
Continuity mistake: After the cutting of Elizabeth's hand, the knife's blade is shown six times. 1st- a wide shot from behind, the blade has no blood on it. 2nd- a close-up, as Elizabeth lets go of the medallion. 3rd- a front shot, as Barbossa lets go of her hand. 4th- when Barbossa puts the gun back into his belt. 5th- when he holds the blade up to his face, we see both sides. 6th- when he grabs the medallion out of the chest. In each of these shots the blood on the blade differs in amount and/or position on either side. This has nothing to do with the 'dripping' of the blood down the blade. (01:12:15)
Continuity mistake: When the medallion drops into the chest, and when Barbossa removes it, there is blood on both sides of the medallion. When Barbossa hits Elizabeth and she falls, the medallion falls near her. In this shot we do not see any blood on the medallion. Yet when Will rescues Elizabeth, she reaches for the medallion and it now has a very obvious blood stain on it. (01:12:20 - 01:13:35)
Continuity mistake: Pintel yells out, "How do we tell?" and his jacket is covering a reasonable amount of the white shirt underneath. In the next shot of him when he's shot by Barbossa, more of the white shirt is visible, so the bullet hole can be seen. (01:12:50)
Continuity mistake: Barbossa finds out the truth about Elizabeth, he hits her and she falls to the bottom of the treasure heap where she lies unconscious. Then Will comes up out of the water to rescue a still unconscious Elizabeth. Her hair is different in both shots, as well as the position of the dress under her face, the pearls, the various objects lying on the ground all around her, and the medallion's chain as well. (01:13:35)
Continuity mistake: After Elizabeth's failed blood ritual, the pirates complain to Barbossa. In this shot, Bo'sun says, "And it's you who brought us..." and Mallet is standing on his own small rock. In the next wide shot, Mallet stands with his feet apart, sharing the rock with Twigg, who's closer to Koehler now. In the next shot, a close-up of Bo'sun, behind him, Mallet is standing on his own small rock again. There are other wide shots, that Mallet is seen standing on the two rocks and Twigg is in the middle of the big rock, closer to Koehler. In other close-ups, Mallet is standing on his own small rock. (01:14:15)
Continuity mistake: After being rendered unconscious by Will, a dazed Jack Sparrow runs into the pirates in the caves after the first blood sacrifice attempt. He turns around and faces Jacoby and another pirate. He turns around once again to face Pintel and all the others. But of the four shots showing Jack, one shows only Jacoby behind him, two just show the smoke from Jacoby's beard, and one shot in between, shows no pirates standing behind Jack at all. (01:15:20)
Continuity mistake: After Will rescues Elizabeth and brings her aboard the Interceptor, in the first shot from behind Elizabeth, Anamaria isn't holding her hat and the pirate behind Mr. Cotton is holding the tail of the parrot to keep it still. In the next couple of shots from the side, Anamaria is holding her hat because it's so windy. Just before Mr. Gibbs says, "Keep to the code," the close-up on Anamaria shows her hands down again, with no wind. In the next wide shot, Anamaria is holding her hat again due to the wind. (01:16:00)
Continuity mistake: When Jack is being locked in the brig, he has something black on his hands when on deck, but as he is being locked away, they are clean. (01:17:00)
Continuity mistake: When Jack and Barbossa are talking on the Black Pearl, Jack begins to eat an apple, then one of the crew comes in, the monkey runs towards Jack, and Jack's hand/arm goes from being close to his chest, to close to his mouth between shots. (01:17:20)
Continuity mistake: Aboard Interceptor, Will and Elizabeth are below deck, and seen on the table are candles on a plate. The three candles and the melted wax on the plate to the right of Will's elbow, differ in the opening shot, when Will says, "Here let me," and when he has the medallion and slams it down onto the table. The candles do not melt so quickly, while they have this very short conversation. (01:17:35)
Continuity mistake: Below deck aboard the Interceptor, Elizabeth gives Will the medallion. When Will clenches the medallion in his fist, the way the chain hangs down his fingers differs in this close-up and in the next shot, also showing his face. (01:19:15)
Continuity mistake: When Barbossa and Jack are chatting in the captain's cabin aboard the Black Pearl after Elizabeth's blood failed to lift the curse, Jack's eyes are lacking their trademark kohl lining. In the following continuous scene, however, as they rush on deck to see the Interceptor, the kohl is in place, although Jack didn't pause to apply it. [Apparantly, it was the first day of shooting, and after Depp's meeting with studio heads, Depp was forced into making Jack look cleaner and to remove Jack's kohl trademark, during those shots. As heard on the commentary.] (01:19:40)
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: Aboard the Black Pearl, when Jack is speaking with Barbossa in the Captain's stateroom, Jack takes a bite out of an apple, close to its stem, with the stem at the top. However, in the following shots, particularly when Barbossa and Jack are on deck, the angle, position, and appearance of the bite mark differ between shots. (01:20:25)
Continuity mistake: When Barbossa looks through his telescope at Interceptor, before Jack says, "I'm having a thought..." she's a good distance away from the Pearl and all her sails are out. Then in most of the wide and close-up shots of Interceptor, some of the sails differ at the bow and stern. Sails raised in one shot, are lowered in another, then some raised again and also some are raised but blowing wildly, then in the successive shot, it's down and still. Their proximity varies throughout and there are way too many changes between shots. (01:20:45)
Continuity mistake: When the Black Pearl is chasing the Interceptor, we can see Will standing at the end of the bow (front) of the ship. Later in the scene, we see him coming up from below deck, where he has been the entire time. Nobody in Jack's crew resembles or is dressed like Will. (01:21:15 - 01:22:45)
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