Continuity mistake: On the dock at Port Royal, Jack is speaking with Murtogg and Mullroy, who are guarding the dock from civilians. Seen behind the Marines to their left is the vacant dock edge. Yet when Jack holds Elizabeth hostage, the same dock edge is seen, but in this shot the edge is now filled with barrels and sacks. No one was on the dock between these two scenes. (00:11:45 - 00:18:40)