Continuity mistake: In the morning, when Will is with Jack at the prison, Will has scratches on his right cheekbone and jawbone and the left side of his forehead. However, after they commandeer the Interceptor, all of Will's scratches are barely even noticeable, but it is STILL the same day. (00:42:30 - 00:52:15)
Continuity mistake: When Elizabeth is dining with Barbossa aboard the Black Pearl, cutting between the front shots and side shots she holds the turkey leg differently in her left hand. Also held differently in her right hand is the bread when Barbossa offers her the apple and she looks at the monkey between the two shots. (00:55:10)
Continuity mistake: After Jack removes Anamaria's hat and she slaps him, her hair frequently changes between front and back shots. (01:02:10)
Continuity mistake: When Jack slides down the rope at the start, the arm that swung him round is facing Jacks left as he grabs the rope. Camera cuts and it is now instantly rotated 90 degrees. (00:19:00)
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 Jack is in the Fort Prison, he's trying to get the dog to bring him the keys. When he says, "Good boy. Come get the bone," the handle sticking out of the pail on the floor is leaning away from the cell. When the dog comes closer, and Jack says, "That's it, doggy," the handle in the pail is facing towards the cell door. (00:36:10)
Continuity mistake: When Jack and Will are under the bridge, and Jack says, "We're going to commandeer that ship. Nautical term," his right cheek is clean. When he turns to ask Will "One question about your business..." there is a broad black smudge running from his right cheek to the right side of his nose. As he turns around after Will's answer and says, "No worries..." his right cheek is again clean, without ever having touched his face. (00:44:35)
Revealing mistake: When Elizabeth gets out of the water on the little island, you can see a modern day bra through her dress. (01:31:25)
Continuity mistake: Aboard the Black Pearl while watching Interceptor explode, Elizabeth runs over to Barbossa and yells, "You've got to stop it." While Barbossa holds Elizabeth, in the first shot behind her, the left shoulder of her burgundy dress is on her shoulder. In the next front close-up shot, her dress is off her left shoulder, then in the next shot behind her, her dress is on her shoulder again. (01:30:55)
Continuity mistake: As Jack and Will are duelling while standing on the cart, and then up on the beams, in wide shots, Will's hair is pulled back perfectly in the ponytail, but in the close-up shots he has loose hair on the sides that is not held in the ponytail. This type of thing occurs numerous times in the film. (00:25:20)
Revealing mistake: During the first blood ritual and other moments in the film, you can tell that Geoffrey Rush's (Barbossa) eyes are yellowish only because he's wearing colored contact lenses. (01:12:45)
Continuity mistake: Elizabeth holds the medallion chain over the edge of the railing. In the first shot she says, "I'll drop it," the chain dangles down with the excess chain over her fingers. In the front close-up of her arm, only the bottom chain is dangling. In the back close-up of her hand, with Barbossa in the background, the medallion and chain dangle shorter now, with the excess chain over her fingers. This takes place before she says, "There's no point in me keeping it." (00:38:50)
Continuity mistake: When Elizabeth is taken aboard the Black Pearl, Bo'sun slaps her face. Bo'sun's hand never makes any contact with Elizabeth's face, but the sound effect makes it very convincing. Also, in the first side shot of the slap, when Bo'sun starts to say, "You'll speak..." it's the back of her left hand that touches her cheek, and we can see the white corner of her night gown under the robe sleeve. In the next front shot, it's the palm of her hand that is touching her cheek now and the white night gown doesn't show at the sleeve. (00:38:10)
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)
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)
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