Audio problem: Barbossa hits Jack in the face and we 'hear' the distinct sound of Jack hitting the ground, though we don't see him actually hit the ground. We do however, see him start to go down and Barbossa yells, "Aaaah," and he starts to go after Jack. In the next shot, Barbossa, who is still yelling, "Aaaah," is behind a running Jack. If Jack did fall he could not have been up and running while Barbossa yells. At editing, they inserted the sound of Jack hitting the ground, for dramatic effect, even though visually in the next shot, we see Jack running immediately after being hit, while Barbossa yells behind him. (01:57:20)
Audio problem: At Isla de Muerta, with his back turned to the camera, Norrington says, "Any attempt to storm the cave could turn into an ambush." Then in the front shot Jack responds, "Not if ..." Before Jack responds in the front shot, Norrington's lips are moving even though he isn't speaking. (01:43:00)
Audio problem: Aboard Interceptor after the downed mast, Will is trapped below deck, as Elizabeth yells to him, "I can't move it," then Grapple and Mallet grab Elizabeth and she screams, "Will!" In the next shot of Elizabeth, she fights to free herself and we hear her scream, "Will!" again, but she's clenching her teeth and her mouth doesn't form the word Will. At almost the same moment that she screams, "Will!" the second time, Cotton's parrot squawks. (01:29:30)
Audio problem: In the scene where Jack is to be hung, there is an official reading off the list of Jack's crimes. In the shot over Will's left shoulder, you can see the reader in the upper left hand corner of the screen. In that shot, you can see that his mouth is not in sync with his words. (02:04:50)
Audio problem: Near the end of the film, Norrington and Jack are in a rowboat discussing an ambush of the Black Pearl's crew. Jack's line "Not if you're the one doing the ambushing" is very slightly out of sync with his mouth movements - his lips keep moving for a fraction of a second after he stops talking. (01:43:05)
Audio problem: At the blacksmith shop, just after Jack says, "You need to find yourself a girl mate," Jack pulls an all wood mallet from the wood ledge above and it actually makes a long metallic rasping sound, which is completely out of sync with the action. In a previous shot Will does a somersault and he grabs a sword hanging from the wood post. When he pulls it off the all wood ledge, it too makes a sharp metallic rasping sound. This is obviously done for dramatic effect. (00:24:25)
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.
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)
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