The part where Jack is handcuffed to the pipe, and the window is under the water. In a few minutes, he looks out of the window from the inside, the water is not above the window yet.
Actually, with the choppy ocean, it's possible that in the shot, the water could be covering the window, and in the next it could still be under the windows top casing.
When a vessel that size is flooding under the waterline and begins to sink, with lifeboats being put into the water, etc, the water is choppy around the ship.
Forget waves, it is clear that in one cut the water is at least 20 feet (6m) above the porthole, and a short while later, the water is about at the center of the porthole.
In this sequence: if the water were over the porthole, Jack would be under water as well. Water flows in a straight line in things that sink. Unless there were a massive air pocket,(one that covered that whole area of the ship), then Jack should have been under water at that point.
When ships sink, they do not do so smoothly, it is done in a bobbing motion, alternating between sinking and rising because of the conflict of the downward pull of gravity, and the upward push of the water. This often causes large waves to ripple along the ship. It is thus, not unlikely that the porthole could be several feet underwater at one time, and not entirely submerged a moment later. Ships sink extremely slowly at first, so if this scene takes place early into the sinking, then it could be a slip-up, because in the first two hours after the collision Titanic only took on a list of about 7 degrees, so the ripple effect would most likely not happen. if it is meant to take place around two am, when the ship took on enough water to become heavier than the water she displaced and, thus, began to sink very rapidly, then this is most likely not a slip-up. Also, (this is directed to Critical Critic) your argument that because the water level was above the porthole the room should have been flooded is incorrect. Titanic drew 34 feet when floating normally, so by the logic of your argument, even if Titanic was not damaged, then the Tanktop, Orlop Deck, and the lower parts of G deck should be flooded. The only way that your argument could be correct would be if Titanic weighed practically nothing, and floated entirely on top of the water.
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