In the scene where Keith Richards is looking up the rule in the pirate code book, the skull ring on his finger is not a prop, he has been wearing it for about 25 years.

In the battle at the end of the movie when all ships are told to "Raise their colours" and each ship raises its flag. A number of the flags raised are the historically documented flags of famous pirates - Calico Jack Rackham, Thomas Tew and many more.

There is an additional poignant scene after all the credits roll.

The 'Hoist the Colours High' song, sung at the start of the movie, tells the story of how the first Brethren court captured Calypso.

For those of you who don't have the first DVD, when Jack considers "The immortal Captain Jack Sparrow," it's a reference to a deleted scene in the first film, in which he looks at his stolen medallion and considers the same thing.

After the ship goes over the falls (essentially the 'edge of the world') to Davy Jones's locker and the scene blacks out, a montage of sound clips is played. These clips are actual sound clips from the park ride itself. This is because the Pirates of the Caribbean ride begins with the boat-shaped cars making a trip over a small waterfall, similar to the boat going over the falls in the movie.

While normally Johnny Depp's real tattoos are covered or hidden somehow, in the scene with the numerous shirtless Jack Sparrows, watch closely. On some of them, they let his real tattoos show.

When Norrington dies, and stabs Davy Jones with his sword, Davy Jones takes his sword from him. Then, at the end of the movie, Davy Jones stabs Will in the heart with that same sword. This was the sword that Will made for Norrington in the first movie.