In The Getaway, just before you get on the ship, stand some distance away from the stairs that lead to the ship. Don't get close enough to Jasmin that she will board the ship. You will hear lots of gunfire. If you just stand there for a few minutes, most of the people on the deck of the ship shoot each other, and you can walk on and get their guns. This strategy is not much of an advantage since it takes time and only saves you a few gunfights, but it is amusing.
After getting on the ship and going below decks, be sure to shoot all the barrels -- the explosions open up the closed doorways.