We seriously hope whoever was
editing this scene was
drunk on Jack Sparrow's rum.
(DING!) That's the only
explanation we have for the guy in the white tee, cowboy hat and sunglasses, walking across the screen right as
the good captain was speaking. Granted, if Sparrow did catch a glimpse of this person, he probably would have
assumed he was just seeing things and then go back to his bottle of booze.