Deliberate mistake: Jack wears one pair of boots throughout the movie; however, the heel has at least two discernible heights, including the ones worn in the underwater close-up. One kind is worn by Tony Angelotti (Johnny Depp's stunt double) and the others are worn by Depp. When Jack steps onto the dock from the Jolly Mon and when he's balancing himself on Will's sword at the attempted hanging, he's wearing the higher heel boots. As Jack crawls across the broken mast chasing the monkey, and when he dives off the Pearl's plank, the lower heel boots are obvious. (01:34:40 - 02:06:30)
Revealing mistake: When Jack is aboard the Black Pearl, as Will makes demands we see Jack's very grimy hands and dirt embedded fingernails. Jack dives and retrieves his sword and gun underwater, and when he does the hands that lift the sword and gun underwater are perfectly clean and have very well manicured fingernails. Once on the island, his hands are as grimy as they were on the Pearl and his fingernails are once again short and dirty. (01:34:50)
Revealing mistake: In the close-up of Jack as he swims to get his gun, etc, his left sleeve is pushed up and it's very obvious that he's wearing something with short sleeves under his white shirt. This isn't part of his white shirt. He has nothing on under his white shirt at any other time. (The underwater close-up of Depp was filmed in a tank at Long Beach along with the close-ups rescuing Elizabeth earlier.) (01:34:50)
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)
Revealing mistake: Jack and Elizabeth are marooned on the island, and he goes down the stairs to the cache of rum. From below, he lifts his right arm up holding a bottle of rum and we see the pirate brand. It's a CG brand, and in this shot, the pirate brand is crooked and off to the side. It doesn't look the same as the close-up when Norrington lifts Jack's sleeve in Port Royal, and it's not because of camera angle. Jack's sun and sparrow tattoo isn't where it's supposed to be either. At this point in filming, this 'tattoo' on his arm is not a real tattoo, it is only applied for specific shots, and make-up didn't apply it for this shot. (This has nothing to do with Depp's real tattoo that he supposedly got later, after filming.) (01:36:15)
Revealing mistake: When saying, Welcome to the Caribbean, love," Jack, who is beside Elizabeth, starts to walk past her and his right hand nudges her left arm, to move her away. In the next close-up, taken later as a studio pickup, it shows him instead handing the bottle of rum to Elizabeth. In the close-up it's not Depp's hand on the rum bottle - the fingers are short and stocky, whereas Depp's are long and slim. Other differences between the outdoor and studio shots include, Jack's red string tied to his braid, Elizabeth's hair is not as messy and windblown, etc. (The original scene is shown in the deleted scenes.) (01:36:30)
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)
Revealing mistake: When Jack and Elizabeth are marooned on the island, Jack wants to know why the rum is gone. Elizabeth sits down in front of Jack, and as he stands behind her, he puts his fists up to his chin in frustration. His right forearm does not have the sun and sparrow tattoo showing, although part of it should be. The entire tattoo would not be hidden under his sleeve, makeup simply did not apply it for this shot. (01:39:20)
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)
Visible crew/equipment: Jack is in one of the boats with Norrington and his men, at Isla de Muerta. Norrington looks through the telescope, saying that he doesn't care for the situation and in the wide shot, when Jack says, "Not if you're the one doing the ambushing," in the water, to the right of the boat, a crew member's green flipper can be seen coming up out of the water. The divers kept the boats steady while filming. (01:43:05)
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)
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)
Deliberate mistake: Throughout the entire film the metalic rasping 'ching' sound is unrealistically heard, even when drawing swords from something like leather holders. Some examples are, at the cave, Jack draws a sword hanging across the shoulder of one of the pirates, and throws it to Will, whose hands are bound. At Jack's hanging, just before Will throws his sword into the trap door to save Jack, Will draws his sword from the brown leather strap. This is obviously done for dramatic effect. (01:52:10 - 02:06:15)
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)
Deliberate mistake: As was admitted on the commentary, the angle of the moonlight in the stateroom, which has a deep overhang outside of the doors, was deliberately vastly exaggerated, to enhance the shots with Governor Swann battling with the disembodied skeletal arm. (01:56:25)
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