Revealing mistake: As the boat is in its final minutes, two of the crew are shown swimming across the deck to get to the dry part. But once they've climbed up, their clothes are still dry.
Revealing mistake: When the stag party are at the National Gallery, there are two shots of Carl, Simon and Gavin standing on a wide area of pavement immediately in front of the Gallery. That area was a road until the redevelopment of Trafalgar Square in 2003. (00:52:15)
Chosen answer: They can be seen in a couple of long shots of the ship's prow as the DJs shelter there. It's reasonable to assume, given that they were present when the rescue flotilla arrived, that they were picked up as well, just off-screen while the film focused on the main characters.
Tailkinker