Well, the boat jumping is part of 2 bugs...
1) when you run into a CV, or other ship, your bow will start to go under, if you hit at the right angle. Usually to the side of the ship. Then when it brakes free it is "bouyant" and jumps out of the water.
2) When you use AH film viewer, the Ships follow the EXACT course.
So if the ship is turning when you film.... in the game its off course (wide turns). That's where I ran into it with the PT. But when you play it back on the viewer, the viewer puts it exactly on course.... so you see the ship in a different place. This leaves the artifact of the collision (boat jumping/rolling) with nothing around it.
PLINK