I’m no expert on image editing in general and even less so with AI image generation, but I’m pretty sure there’s some weirdness where the foreground of the boat interacts with the background of the water.

The railing (which dips in and out of view suggesting the ship is flexing in a way that may or may not be one of those “engineering is actually just absurd” things) seems to be overlapped by the background in a manner that looks plausibly like a compression artefact except for the way it moves:

You can also see that some of the specks in the glass (which are consistent from the video start) appear to get “lost” in the background and/or picked up and carried away by it. Particularly note the one in the top left that “flashes” as it passes a brighter area of the background, but the flash starts several frames before they actually overlap.

There are some other slop-ish but non-definitive aspects like this thingy and its wobbly outline:

But in general this is very convincing.

I should stop nerd sniping myself investigating these things.