The cat's claws catch onto its own belly fur at 0:04

The cats don't have human expressions/behaviour the way that AI cats usually do. The cats in the background don't look worried. And the clumsy cat doesn't look back in gratitude after he's down

Also, this is normal cat behaviour. Ask a cat person

The Chinese sign is also realistic

Also, I don't think AI can create a 43-second uncut video of this quality yet: http://xhslink.com/o/8AwevjfFQl7