Audio problem: Barbossa hits Jack in the face and we 'hear' the distinct sound of Jack hitting the ground, though we don't see him actually hit the ground. We do however, see him start to go down and Barbossa yells, "Aaaah," and he starts to go after Jack. In the next shot, Barbossa, who is still yelling, "Aaaah," is behind a running Jack. If Jack did fall he could not have been up and running while Barbossa yells. At editing, they inserted the sound of Jack hitting the ground, for dramatic effect, even though visually in the next shot, we see Jack running immediately after being hit, while Barbossa yells behind him.
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.
Audio problem: Aboard Interceptor after the downed mast, Will is trapped below deck, as Elizabeth yells to him, "I can't move it," then Grapple and Mallet grab Elizabeth and she screams, "Will!" In the next shot of Elizabeth, she fights to free herself and we hear her scream, "Will!" again, but she's clenching her teeth and her mouth doesn't form the word Will. At almost the same moment that she screams, "Will!" the second time, Cotton's parrot squawks.
Audio problem: In the scene where Jack is to be hung, there is an official reading off the list of Jack's crimes. In the shot over Will's left shoulder, you can see the reader in the upper left hand corner of the screen. In that shot, you can see that his mouth is not in sync with his words.
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.
Audio problem: At the blacksmith shop, just after Jack says, "You need to find yourself a girl mate," Jack pulls an all wood mallet from the wood ledge above and it actually makes a long metallic rasping sound, which is completely out of sync with the action. In a previous shot Will does a somersault and he grabs a sword hanging from the wood post. When he pulls it off the all wood ledge, it too makes a sharp metallic rasping sound. This is obviously done for dramatic effect.
Audio problem: Just after Gibbs tells Will the story about Jack roping a couple of sea turtles, Jack yells out to the crew, "Let go the anchor." We hear on the audio some of the crew respond, "Ahoy Captain aye." The Region 1 DVD subtitles say, "Aye Captain aye." Yet, when you look at two crewmen's lips, it looks like something else. It possibly could be, "Let go the anchor aye." Either way, their lips do not match the audio.