Continuity mistake: Just as Will jumps on the rail of the Pearl with the gun, in the back shot, his right hand holding onto the rope is shoulder level and wind is blowing his hair towards his face. In the next few front shots, his right hand holds the rope between sternum and waist level and his hair is not blowing at all. Then in the next back shot, once again his hand is at shoulder level on the rope, and the wind is blowing his hair towards his face. (01:31:25)
Continuity mistake: As Will stands on top of the rail of the Black Pearl, holding the gun, in the close-up and in the wide shots of Elizabeth, her appearance - the neckline of her dress and slip, differs. (01:31:30)
Continuity mistake: Aboard the Pearl, Barbossa says, "Did you not notice? That be the same little island we made you governor of on our last little trip." While he says those words, hair, etc, keeps changing. 1st shot - the wind blows their hair the same way. 2nd shot - Jack's ponytail at the top of his head is blowing in a different direction. 3rd shot - the wind doesn't blow their hair at all. 4th shot - their hair is blowing just like in the second shot. 5th shot - the wind doesn't blow their hair at all again. (01:33:55)
Continuity mistake: Elizabeth has a light tan and her hair has lighter streaks running through it, in the shots on the island with Jack. In the following scene, on the Dauntless, her tan is gone and her hair is normal again. Confirmed on commentary. (01:35:00 - 01:40:00)
Continuity mistake: When Jack and Elizabeth are on the island Jack lifts the hatch to the underground cache of rum. In the first shot from below, the top stair is visible at the opening above. In the next shot from above the design/shape of the top stair is very different. Bramble disappears between shots as well. (01:36:00)
Continuity mistake: On the island, after regaining consciousness, when Jack puts his hands up to his face and desperately asks, "But why is the rum gone?" his fingernails are totally clean. However, in the earlier shots while getting drunk, his fingernails are very dirty, before passing out. (01:39:15)
Continuity mistake: On Dauntless, when Elizabeth tells Gillete that the pirates can't die, she is wearing a loose braid in her hair. Later, when she is tying the cloth together in order to escape, she is wearing an almost perfect braid. And even later after leaving Dauntless, when rowing the boat towards the Black Pearl, her hair is messed up again. (01:43:35 - 01:50:35)
Continuity mistake: Aboard Dauntless, Governor Swann is talking to Elizabeth through the closed doors. As he says, "I couldn't be more proud of you," the table is shown being right next to the dresser and the table is devoid of any rolled papers. When Governor Swann is battling with the skeletal hand, Not only does the table have rolled white paper on it now, there are two large trunks, between the table and dresser now, and more rolled paper. (01:49:45 - 01:56:15)
Continuity mistake: When skeletal Pintel and skeletal Ragetti are in the rowboat their appearance and parasols differ between shots, and later, when Pintel attacks Ragetti in the wide shot, the two oars are each hanging off its own side of the boat. However, in the close-up one oar is now lying across the two sides of the boat. (01:51:10)
Continuity mistake: At the opening of the scene in the cave of treasures, Jack lifts up a well endowed golden statue, looks at it awhile and tosses it back into the pile, as he clues Will with talk of honesty and dishonesty. Later in the scene, Jack and Barbossa are fighting in front of that same pile and the golden statue that Jack had thrown earlier is now sitting upright behind the chandelier. (01:51:40 - 01:52:40)
Continuity mistake: Near the end of the first scene of the Isla de Muerta duel, we cut from Will's fight to Jack and Barbossa (just before "You're off the edge of the map"), and we have a good view of the cave. Where did Will and the other pirates go? (01:52:40)
Continuity mistake: When Barbossa takes the sword out of his own chest, he then stabs Jack with that sword, and he stabs Jack right under the strap and buckle. As Jack walks backwards, into the moonlight, the skeletal Jack appears and now he has the sword over the strap and buckle, in his chest. The length of the sword between the guard and his chest differs greatly, as does the amount of sword that protrudes from his back. (01:55:15)
Continuity mistake: Barbossa chases Jack, who knocks over a small table and he yells, "Sorry." In the next shot, that table is rolling down, with its legs facing towards the wall, with the treasure beside it. Yet in the next shot from below, the table top is close to that wall, not the legs. Also, the arrangement and existence of some of the treasures lying all around differs in the front shot of Jack and the back wide shot. (01:56:55)
Continuity mistake: Aboard the Black Pearl, just as the boat is released to swing out towards skeletal Grapple and Mallet, a rope is seen attached to the left hanging apparatus and that rope is draped across three of the seats. In the next shot, after their bones are knocked overboard, the rope in the boat is not over any of the seats but coiled up near the hanging apparatus. (01:57:30)
Continuity mistake: Just before Elizabeth whacks Jacoby, she asks, "You like pain?" and in the first shot as she starts to swing her hair has some waves and curl to it. Mid swing it cuts to the second shot, and when she says, "Try wearing a corset!" her hair is totally flat with no waves or curls whatsoever. Then, in the very next shot it's actually full, wavy and curly. (01:59:45)
Continuity mistake: After Elizabeth whacks Jacoby and tells him to try wearing a corset, she helps Will to his feet. In the close-up of Will smiling and looking at her, his hair is noticeably wet and very stringy. However when Elizabeth asks, "Whose side is Jack on?" Will's hair is no longer wet. (01:59:50)
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: During the final duel between Barbossa and Jack, Will runs to the Aztec chest. Jack tosses the medallion to Will, and as Barbossa turns his head, we see the white shirt collar. Barbossa pulls out his gun and aims it towards Elizabeth. In Barbossa's front shot, there is barely white collar showing, but in the next side shot, the white collar shows on both sides. Jack shoots Barbossa, and in the front shot, there's barely white collar showing. When he turns to look at Will, and when he turns back towards Jack, the white collar shows again. (02:00:40)
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)
Continuity mistake: While standing near the Aztec chest, Will says, "He didn't waste it," and in this shot there are two buttons closed on his vest, over the belt buckle. Yet, in the close-up of Will's hand dropping the two pieces of gold, there is only one button closed on his vest, over the buckle. (02:01:10)
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