I lost count on what the next number is, but
Jack walking through the tavern and never being hit in the fight going on around him and Beckett descending the steps as the Endeavor is blown apart.
DJ doing that transference supernatural thing into the cell with Calypso and on the mast with Jack.
Tea cups are the same as the wedding cups in DMC.
Dog has keys, but to different lock.
Jack tells Lizzy in COTBP "unless you have a rudder and alot of sails in the bodice...." In the bathhouse in AWE Lizzy has to disarm and pulls out more arsenal on her person than the armada. Makes me wonder if she could have had a rudder and alot of sails in COTBP it would have been a little different.
Why is the rum always gone...but, I think it was "the rum is gone"
Slaps all around by the strumpets.
Jack sending Will off the ship into the unknown.
Jack breathing on Will like he did to Gov Swann and Norrington in COTBP.
A spit of land scene in all three.
Raining in both wedding scenes.
Will is on a raft in COTBP and DMC. He is on a rafty ship in AWE, plus Jack sets him adrift on a big rum barrel.
Lizzy has a new costume for each movie and everyone else has the same one for all three.
Norrington has one curl on each side in COTBP, but two on each side in AWE.
That's all I can think of now. Maybe more later.