Revealing mistake: Either the first shot has a gratuitous view of the fort or the composite people neglected to add the fort in the second shot. Norrington says, "...this is the day that Capt. Jack Sparrow almost escaped. Take him away." The night shot that follows, shows the bridge archway, and beyond it the pier, Interceptor, the fort and its parapet. After Will breaks Jack out of prison, they approach the same archway and beyond it is the pier and Interceptor, but in this shot we don't see the fort and its parapet, nor the line that Jack slid down the day before. The camera angle is exactly the same.
Visible crew/equipment: At the blacksmith shop, Jack and Will start to duel and Jack asks, "But how's your footwork?" In the next close-up shot of their feet, the imprint of a modern, flat bottom trainer/sneaker sole can be seen on the dirt floor at the bottom right of the screen. It is not the imprint of a heel and sole of the time period. As a point of interest, on the video version of this film there are multiple imprints visible.
Visible crew/equipment: When the dock master tells Jack, "Hold up there you. It's a shilling...," seen in the background on the left of the screen is a thatched roof enclosure. An orange aluminum ladder is sitting under the thatch. Many of the crew's orange aluminum ladders of various heights can be seen on DVD 2.
Continuity mistake: When Jack sails toward Port Royal, he passes the skeletal remains of hanged pirates, to whom he pays a respectful bow. First, there are two wideshots of the skeletons, then in the close-up they are actually wearing more clothing, particularly the strapping middle guy, whose head position differs, and his straw hat is larger as well.
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.
Visible crew/equipment: When Jack and Barbossa duel in the cave, Barbossa hits Jack in the face. Barbossa yells, "Aaaah," and Jack takes off running with his arms waving wildly in the air. In this shot, as Jack waves his arms, at the bottom right corner of the screen, the wood scaffolding that was built for the cave set can be seen near the rocks in the water. The cave set scaffolding can be seen being built on Disc 2 of the DVD.
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.
Continuity mistake: When Jack jumps down from the mast yard arm on the Jolly Mon to bail water, in the far wide shot, the mast pennant lies still, yet blows wildly in the previous shots and the bottom left of the sail is caught up on line from the rigging, but in the following shots, it's not. Also, in the wide shot he starts to walk to the middle of the boat, and he puts his arms out as he's starting to pass to the right of the mast. In the next close-up of Jack, he's passing the mast on the other side.
Visible crew/equipment: On the dock, when Jack grabs the rope, flies up and escapes, the cannon comes crashing down onto the dock. When the wood planks break (pre-cut wood), two Marines fall into the hole. Seen hanging under two of the remaining fixed wood planks are strips of tape that was used to help secure the pre-cut wood together with the fixed wood. Another view of this is also seen on DVD 2.
Visible crew/equipment: During the cannon attack on the harbour near the beginning of the film, a spring board, used to propel one of the stuntmen dressed as a sailor into the air, is visible during an explosion near the dock.
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.
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.)
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.
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.
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).
Continuity mistake: In Port Royal, during the pirates looting, the sign comes crashing down onto Grapple, and Will says, "Good bye." In the next wide shot, behind Will to his left are a large and small barrel up against the wall, the large one being right in the corner. As a passing pirate hits Will on the head with a candlestick, in this shot both barrels are now further from the corner and closer to the door.