Factual error: The helmsmen on the ships always spin the wheel in the direction that they wish to turn. However, in the days of sail the wheel had to be spun in the opposite direction from the direction of turn. (01:56:00)
Continuity mistake: When we first see Jack as the "god," the multiple eyes painted on his face are sharp and defined. In the brief second shot, where we see the left side of his face, they appear worn and blurred. The third shot shows them sharp and clear again. (00:23:40)
Continuity mistake: When Pintel, Ragetti and the dog are in the boat, the corner of Pintel's collar is folded up when he says, "Aint that right, poochy?" and also when the dog jumps into the water, yet, it is folded down in the other shots. (00:29:15)
Continuity mistake: After Tia Dalma hands Jack the jar of dirt, the jar is positioned differently within Jack's grasp between shots - note the lid. (00:53:30)
Continuity mistake: During the dice game aboard the Flying Dutchman, when Will challenges Davy Jones, the cloth with the key drawing is folded and positioned differently between shots. (01:21:00)
Continuity mistake: When Elizabeth, Will and the rest watch from the long boat, as the Kraken takes down the Pearl with Jack aboard, in the shot facing the Pearl Cotton sits directly behind Will, but in the shot facing the long boat Pintel sits behind Will. (02:14:55)
Audio problem: Before the Tortuga bar brawl the musicians are shown playing their instruments. When Elizabeth says, "I just wanted to have the pleasure of doing that myself," it is quiet in the bar, but the violinist is seen happily playing directly behind her and no sound is heard. (01:08:20)
Revealing mistake: In the first scene where we see Elizabeth talking to Jack on the deck of the ship, you can tell that Elizabeth is wearing a wig. When she turns to Jack, the wind blows her hair over the front of her shoulders, and you see her real (very short) hair on the back of head. When it cuts back to an over the shoulder shot of her, her wig is now covering her real hair. (01:37:30)
Continuity mistake: After Will challenges Jones he is given five dice - one being considerably smaller than the other four. However, when Will looks under his cup during the game, all five dice are of similar size. (01:22:00)
Factual error: At the bar in Tortuga, one of the three musicians is seen playing the 'concertina', but it was not invented yet. Sir Charles Wheatstone, an English physicist (b.1802 - d.1875), invented the 'concertina' around the mid 1800's. The 'concertina' is a small musical instrument like an accordion, with bellows and keys. (01:06:10)
Continuity mistake: When Jack shoots a hole in the casket killing the bird, the amount of feathers on the casket differ between the shots. (00:06:00)
Continuity mistake: At Tia Dalma's, the key cloth is placed on the table, and in following shots the things such as the cloth, bones and jewelry scattered on the table change position. (00:51:50)
Continuity mistake: When watching Will, Jack, and Norrington sword fight on the beach, Elizabeth's nose and cheeks are slightly sunburned. When back on the ship, they're only tanned, and no longer burned. (01:44:30 - 01:55:20)
Continuity mistake: After Jack takes the heart out of the chest he hurriedly closes its lid, the locks engage, and the key's end remains in the horizontal position when Jack runs off. However, when Pintel and Ragetti grab the chest the key's circular end is now vertical - the key does not turn itself. (01:51:00)
Continuity mistake: When Elizabeth questions Jack about his "broken" compass as they stand on deck, her left arm rests on the deck rail and changes position back and forth between shots. (01:36:30)
Continuity mistake: When Jack is trying to get the handcuff off his hand at the end of the movie, he has all of his rings turned inward to make it easier to get it off. But when the shot changes into a wide shot, as he pulls off the handcuffs, all of his rings are facing the right way. (02:09:10)
Continuity mistake: On the Pearl, after Elizabeth tells Norrington that she trusts Jack, when Norrington walks away from the deck rail, in the shots facing Elizabeth, the pretty cumulus clouds behind her change back and forth between shots. (01:28:50)
Continuity mistake: Aboard the "spirit bride" ship, when Captain Bellamy complains about port tariffs, he places two small papers on the desk (atop the map) in the close-up, yet there is only one in the next shot, as he adds more papers. (01:03:10)
Revealing mistake: When Will and Norrington duel on the roof, in the wide shots the face of Will's stunt double is rather obvious. (01:47:30)
Continuity mistake: When Jack removes the beating heart from the chest, the way the heart is positioned in his hand changes between shots - note the large arteries. (01:51:00)
Answer: The jar was to put Davy Jones heart in. He can't touch dirt ever again since he failed to keep up his duties which means he wouldn't be able to get his heart back.