Continuity mistake: Johnny Depp's wig changes subtly throughout the film. Most of the time he has many dread locks. Other times, he has many fewer dreads and more stringy curly pieces.
Continuity mistake: In the scene early on in the movie, where Lord Beckett and Elizabeth are talking, behind Lord Beckett you can see a man sitting on a seat suspended in the air by two ropes, apparently working on a ship or something of that nature. Then, the camera cuts to Elizabeth and when it cuts back to Beckett, the man in the background is gone, and the seat or ropes are no longer there either.
Continuity mistake: Throughout the film, Will's hair continually changes position between shots, such as hanging loose, then behind his ear, and back again, or vice versa; for example, when he holds Elizabeth's dress aboard the "bride spirit" ship.
Continuity mistake: At the end of the film in Tia Dalma's hut, when Tia is handing out drinks, just before Gibbs gives his two cents about Jack, there is a wide shot of the whole group and Gibbs can be seen pushing away from the doorframe and standing up. The camera cuts to a closer shot of Gibbs, and he pushes away from the doorframe a second time.
Continuity mistake: When Tia Dalma holds the tray with two candles and a mug (the others were given out), as she asks if they would be willing to do anything, the position of the mug changes between shots.
Continuity mistake: When Tia Dalma asks, "Would you sail to the ends of the earth to fetch back witty Jack and his precious Pearl?" her lips are only partially covered in black. However, when she says, "Then you will need a captain who knows those waters," her lips are covered entirely in black.
Continuity mistake: At Tia Dalma's, when Will tosses the knife at the tabletop, there is a tall slim candle beside his right hand. However, in the next shot when Tia Dalma says, "Against the cold and the sorrow," the candle beside his right hand is now very short, though no time has passed. (This doesn't refer to the short, wide candle in both shots.)
Continuity mistake: When Norrington, Elizabeth and Jack find the chest they wipe some sand off and there are black parts of the chest visible. When they pull the chest out of the ground, all the black bits are gone and is covered in sand.
Answer: There is a scene after the credits of "The Curse of the Black Pearl": the monkey got back to the cave and took a coin. That way he turned undead again.
Bjoern_Buller