Visible crew/equipment: During Jack's escape, he swings about on the rope. As he does, in the shot immediately following Jack's first close-up, the film crew's blue flat-topped boat, as well as their speed boat with its trailing wake, are both visible at the bottom left of the screen. (This is ONLY visible on the video version.)
Continuity mistake: A bit after Jack says, "You need to find yourself a girl mate," Jack tosses a mallet at Will. As Will ducks, in this shot the hose on both legs are rolled down to his ankles. Yet just after Jack says, "Or perhaps the reason you practice 3 hours a day...You're not a eunuch are you?" Will's hose are obviously pulled up properly. Orlando Bloom wore the hose rolled down during much of the shoot, when it was supposedly not visible onscreen. (This is ONLY visible on the video version.)
Visible crew/equipment: As Norrington and his men board the Dauntless he says, "Search every cabin, every hull down to the bilges." In the next shot a crew member with a white baseball cap and green shirt is actually visible hiding under the gangplank. (This enjoyable shot is ONLY visible on the video version.)
Deliberate mistake: Not only is the angle of the moonlight that shines through Jack's prison cell window intentionally exaggerated to enhance the shots with Jack, doggy, Koehler and Twigg, but in relevant shots, the moonlight is not seen coming through the window or the broken wall. Nor is it reflected on the floor outside the cells or in the cell next to Jack, particularly in the shots from the dog's POV looking up the corridor towards Jack. (00:36:00)
Visible crew/equipment: After Will admits to Elizabeth that he loves her, she looks over and sees Cotton's parrot sitting on the flag post. Mullroy is also watching as a black-haired crew member, wearing a short-sleeve, white tee-shirt, can be seen holding the post and shaking it with his bare arm to get the parrot to fly off. (02:06:00)
Visible crew/equipment: On Isla de Muerta, Barbossa yanks the chain off Elizabeth's neck, grabs her hand and in the next shot as he places the gold medallion in the palm of her hand, the crew's metallic reflector screen is clearly visible on top of the Aztec gold chest, it even moves a bit. (This is ONLY visible on the video version.)
Visible crew/equipment: At her home, in the shot facing Elizabeth just as she tries to whack Ragetti with the bed warmer he grabs hold of it and camera equipment is visible at the lower left corner of the screen. Two shots later facing Elizabeth in the same angle, as she and Ragetti hold the bed warmer the equipment is still there. (This is ONLY visible on the video version.)
Continuity mistake: Will walks through the crowd at the hanging and stands in front of the scaffolding looking at Jack, as the official reads the list of Jack's crimes. The rope wound around the beam is wound differently here than in the close-up shots. The rope that leads up to the noose is in front of the beam. In the next semi close-up of Jack, when he smiles at the hangman, the rope that leads to the noose is now on the opposite side of the beam. (02:04:50)
Continuity mistake: Just before Captain Jack Sparrow threatens Elizabeth Swann, watch her medallion. In one shot the medallion is over her dress, but in the next one, it is under it again without anyone having touched it. In the following shot, when Jack puts the chain around her neck, it is out again. (00:18:30)
Visible crew/equipment: At the Swann home, after the shot of Will nodding to the passing butler, when Governor Swann walks down the stairs as he says "Ah, Mr. Turner," a mat is visible on the foyer floor between the chair and table. The mat is also visible when Will flips the sword. However, when Governor Swann, Elizabeth and Will leave the house, the mat is gone. (This is ONLY visible on the video version.).
Continuity mistake: Aboard the Pearl, after Elizabeth begins to eat the turkey leg, in the shot facing Barbossa as he pours her wine, there is a hunk of bread with a bite taken out of it on Elizabeth's plate which wasn't in the previous shots. Problem is that it's not until three shots later that Elizabeth actually takes bread from the platter and bites into it, before dropping it. (This is ONLY visible on VHS.)
Revealing mistake: Right after Jack and Will commandeer the Interceptor and are moving away and Commodore Norrington climbs the stairs and says, "Just get them in range of the long nines," you can see a jet contrail in the sky behind him. (00:47:45)
Continuity mistake: Will goes to the fort the morning after the pirate rampage in Port Royal. Will says, "We have to hunt them down. We must save her," and his shirt collar is very crooked. Governor Swann says, "If you have any information concerning..." and in this shot Will's collar and vest are straight. In the following shots the shirt collar is crooked again. (00:41:20)
Continuity mistake: At Isla de Muerta, when Will's hands are bound, Jack tosses Will the sword. In the two shots facing Will, first as he catches it then as he pushes the bald pirate, Will's hose are rolled down, whereas in the previous and following shots his hose are on properly. Orlando Bloom preferred to have the hose down during much of the shoot, when it was supposedly not visible onscreen. (This is ONLY visible on VHS.)
Revealing mistake: On the way to Isla de Muerta aboard Interceptor, during the storm there is a close-up of Jack's hand holding the compass. There are many other close-ups of Jack's hand in the movie, but in this particular close-up, it is not Johnny Depp's hand holding the compass. Depp's fingers are slim and normal looking, but in this close-up Jack's thumb is stout and has a severely enlarged/deformed metacarpal at the base of the thumb joint (likely arthritis). (01:03:35)
Continuity mistake: Will's facial hair darkens quite a bit in the time it takes him to walk from Elizabeth's house to his blacksmith shop. (The sword scene in the Governor's mansion was the first scene that was filmed with Orlando. His facial hair was not fully grown in because he had just arrived on set. On commentary.) (00:07:05 - 00:22:05)
Continuity mistake: At Port Royal, Jack attempts to escape by holding Elizabeth hostage. After she puts his hat on in the first shot, while their bodies are extremely close, her right arm reaches under his left arm to go around his back in order to put the strap with the buckle on. Yet, in the next close-up, they haven't moved but now her right arm is over his left shoulder. Quite impossible between shots. (00:19:10)
Continuity mistake: Aboard the Black Pearl, Pintel and Ragetti load the cannon with the chain-link cannonballs. As the cannon fires, in this shot from outside the port hole, the rungs of the steps on the side of the ship are to the right of the port hole. This shot has been flipped. The rungs are really to the left of the port hole, as seen when they load the cannonballs into the cannon and other shots throughout the movie. (01:26:55)
Visible crew/equipment: When Barbossa's crew are invading Port Royal, two pirates run past Will carrying loot. One whacks Will on the head with a silver candlestick. As Will falls backwards, the crash mat is clearly visible on the ground behind him. (This is ONLY visible on the video version.)
Visible crew/equipment: During the attack on Port Royal, after Will tosses the axe, in the shot facing Jacoby's back as the axe hits him, the blue crash mat is visible in front of him, at the bottom left corner of the screen. (This is ONLY visible on the video version.)
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