Good post on plot holes and the awkward ways in which movies try to handle them. (I even hijacked the above picture from the original post, which I usually go out of my way not to do.) (RogerEbert.com)
I first noticed this tactic being employed in a film involving no shortage of boats, in fact. "Pirates of the Caribbean: At World's End" sees the gang off to the underworld to rescue Jack Sparrow, following his death at the climax of "Dead Man's Chest." Since that film ended with Captain Barbossa's resurrection, courtesy of voodoo priestess Tia Dalma, two comic relief sidekicks can't help but inquire, as anyone in the audience who's even kept track of the plot might as well, why she didn't apply the same treatment to Captain Jack? Ah, she answers, but Barbossa was only dead in spirit, his body still earthbound, while Jack has gone to the other side body and soul. The answer makes about as much sense as the rest of the plot, and so it, in turn, beats ever onward.