Revealing mistake: When Blackbeard threatens Jack with a pistol, he is heard cocking it, but when he holds it up to the camera we can see that it is only on half-cock. A pistol cannot be fired in the half-cock position, nor can it be loaded in the fired position, implying that either it is not loaded, or a technical error has been made by the film makers.
Revealing mistake: You can see the mermaid's underwear after she is given only a shirt by Philip. It appears to have red in it, which can be seen through the white shirt given to her.
Revealing mistake: When Jack Sparrow is chased in London, being on the carriage and looking back to his chasers, you can see the broad tire tracks of a modern vehicle in the mud. (00:16:55)
Revealing mistake: Just before he sees the droplet of water moving upwards, Jack moves three leaves to get through, but the top-right one is just held in his hand and you can see the cut stem of it. (01:42:20)
Suggested correction: These movies aren't set in a specific time.
Credit for the following goes to another member here, Super Grover, who actually answered a question about the dates the films are set a while ago. These dates are estimates. The intro of 'PotC: The Curse of the Black Pearl' takes place mid-1720s (roughly 1725), when Will and Elizabeth are around 11/12 yrs old. Then eight years later the duo are about 19-20 yrs old during the main part of 'The Curse of the Black Pearl', then around a year later are set to marry in 'PotC: Dead Man's Chest' followed by the consecutive 'At World's End', which take place around 1733 / 1734. The next movies 'PotC: On Stranger Tides' and 'Dead Men Tell No Tales' (after the intro) take place in the 1750s. Again, credit to Super Grover.
Ssiscool ★
They're set in the 1700's. In "On Stranger Tides", King George wants Jack to find the Fountain of Youth before King Ferdinand, who reigned from 1746 - 1759.
Bishop73