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: The right side of Elizabeth's face is twice slapped very hard (first by Boswain and second by Barbossa) but she never has a noticeable bruise, swelling, or other injury to her jaw or cheek.
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: Anamaria's hat is turned, so the flap is on the side of her face when she says, "It was a good plan. Up till now." In the shots before and after, the flap of her hat is in the front. (01:23:00)
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: When the Pearl chases the Interceptor the sea changes frequently from rough, to (relatively) calm sea. That cannot change that rapidly.
Continuity mistake: When Elizabeth is dining with the captain of the Black Pearl, he takes out the medallion, and the medallion's position changes during shots on his hand. (00:53:40)
Continuity mistake: After Jack tells Will, "Nice hat," he starts to run up the stairs. Next shot, Will smiles and behind him Norrington starts to run towards Jack. In the next shot, Norrington is already up the steps with his sword held high, pointed at Jack, who shouts, "Friends." Then, when the camera faces the crowd, Norrington is still lower and his sword is down. In the next close-up and wide shot, Jack's at the top of the stairs, with Norrington higher up again, sword held high, pointed at Jack. This is not because of camera angles. (02:09:20)
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)
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)
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)
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