Other mistake: Pintel and Ragetti fire the chain link cannonball, and it hits the square rigged mast aboard Interceptor. There's a shot of two men falling from the top of the mast, just before Interceptor's mast crashes onto the Pearl. They are not part of Jack's crew, who are all accounted for aboard the Pearl later. The only one of Jack's crew to die is the Asian man, when he's stabbed by a pirate and falls overboard. Nor can they be Barbossa's crew, because they haven't boarded yet. (01:27:00)
Other mistake: Keira Knightley has very obvious makeup applied to her cheeks and especially her eyes and lips throughout the movie. First example, when she gives Will the medallion in the cabin, and second, when Barbossa points the gun at her, before Jack shoots him. Actresses wear makeup in movies, but the lip color and eye make-up are unrealistic for a kidnapped Elizabeth. It shouldn't be as dark and apparent, as it is in this movie. (01:18:10 - 02:00:55)
Other mistake: When Elizabeth invokes the rite of parley with Captain Barbossa and first boards the Black Pearl, you can see the red flashing along with the booms of the cannons. As Elizabeth bargains with the captain, the flashes continue. After Captain Barbossa orders the guns stilled, the sound stops, but the flashes continue through the end of the scene even though they are no longer firing the cannons.
Other mistake: When Elizabeth is watching the attack on Port Royal from her balcony, the Black Pearl is at least two miles away. And yet one shot is able to hit the house.
Other mistake: When Captain Jack Sparrow is swimming up to the surface after ripping the dress off Elizabeth, he is swimming with both of his arms because he has Elizabeth draped over his shoulder. There is a considerable distance between Jack and Elizabeth. Also, when both of them are close to the surface, not only are both of Jack's arms out swimming, it can be seen that Elizabeth's double also paddles with one arm to assist in swimming to the surface. (Slow motion makes this easier to spot, but isn't vital.)
Other mistake: When Elizabeth stabs Barbossa, he pulls the knife out and there is blood on it. Why is there no blood on the sword later when he pulls it out of his stomach during his duel with Jack?
Other mistake: Ragetti's wooden eye always moves in sync with his real one. At that time, a prosthetic eye (wooden or otherwise) would remain stationary or move around independently from the real one. Even if this is a magical benefit of his 'cursed' state, it still moves in sync when he's transformed back into mortal form. (00:30:45)
Other mistake: When we see Jacoby lying face down with the axe in his back, we can see how far the axe sticks out. It's not deep enough in his back to stick out with that weight of wood and metal. That axe would never stand upright, it would fall to the side.
Other mistake: Translate problem - only in Hungarian version. In the scene, when Jack and Will are fighting, the blacksmith hit Jack from behind. Captain Norrington arrives, and say: Szép munka, Mr. Swan. (Good work, Mr. Swan.) The blacksmith's name is Brown.
Other mistake: When the Interceptor reaches the "boat graveyard" just off the dreaded island, it hits a pole or other assembly from another boat underneath them. It then "falls", literally plummets, downward and hits the ground with a thud. But wood doesn't "fall" downward through water, in fact, most wood swims. Even with other metal or other objects attached to it, this whole piece/assembly would have to be solid lead to "plummet" at that speed through water. No matter what the material is, it cannot go down that fast through water.
Other mistake: When Jack looks at the Pearl from his prison window, he is at least 10 boat heights above the ship. As we see throughout the movie when we look at the cannons of the Pearl and how they stand on the floor and shoot through the openings of the ship, there is no way that they could be rotated upwards to shoot as high as would be necessary to hit the prison cell.
Chosen answer: Because they'd have to find it. The gold may "call to them", but it obviously doesn't function as a millimetre perfect homing beacon or they'd never have missed the medallion years earlier when they attacked the ship carrying the young Will. Elizabeth drops it into the sea and they're going to have to spend what could be months trying to locate it - currents could take it well away from the dropping point. They've found the final missing piece; they're potentially just hours away from finally being cured. The last thing they want is to see it thrown into the sea.
Tailkinker ★
Well, if the crew was anxious to get the medallion then why did they act like they weren't interested in it before Elizabeth pretended to drop it?
Reverse psychology.
Ssiscool ★
What do you mean by reverse psychology?
By showing they are not interested in the medallion they are hoping Elizabeth will just drop it on the floor or chuck it to them as it's of no real value. However when she releases a bit of chain and the medallion drops, and the pirates lurch forward revealing that they really want the medallion and as such Elizabeth now has the upper hand in negotiations.
Ssiscool ★
I'm guessing Elizabeth wasn't fooled when the pirates showed disinterest in the medallion.
That's not called reverse psychology, which is used to encourage someone to change his or her mind. Doesn't work with a threat. They are feigning indifference to hide the importance of the object.
lionhead
They didn't want to give her an advantage over them. Pretending to not care about the coin would make Elizabeth think that the coin is worthless and cannot use it to barter a deal.