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You knew upfront that it was generated. I did too so the first thing I did was look at the lips of the actors convincing myself that there were flaws.

When it comes to fish swimming around I don't think I would be able to reliably tell what was real vs generated even with deep inspection.

Something in their eyes. Looks very robotic / lifeless for me. And the sound-mixing is very off. Clearly feels like the voice was layered on top of whatever sound is in the background and not blended.

I don't think I can see the difference. I just have my skin crawl because I'm expecting to see something off and generally have a bad feeling about it.