What triggers your spidey sense that you can tell it's slop? I can see it after it's been called out, but I feel like I'm not catching it instantly (like an uncanny valley)

I can now see that:

the yellow dick is the only one with a urethra, the hand around it fades from green to yellow, the faces look like caricatures instead of photoshop (too smooth), and the green dick is the only one slightly obscured by a face

But I hate that I don't (almost) instantly notice, so maybe I need to pause for a second and consider if it's slop... because it's so rampant? What sticks out to you that you can call it?

Edit: it's the faces, isn't it? Like poorly drawn and too well done at the same time? Or that nothing is symmetrical in a weird way? Idk

EditEdit: I also love that funhole has so many of these "PSA's" being posted. They're fantastic