Eventually you'd get down to one hair cell, if that is cut in half it is no longer hair.

The cartoonist draws the line. I'm just a dog on the internet.

Yes, that is where we draw the line, because the things you listed are all part of the joke. The reflection is not (and is almost certainly due to lack of skill because reflections can be hard).

Should we never criticise any unrealistic aspect of something as soon as it contains one deliberate unrealistic aspect? Is the coffee cup on game of thrones unproblematic because we can just as well imagine they have Starbucks in Westeros as dragons? If someone draws a comic with a talking animal, is it no longer possible to critique the anatomy in their drawing?

Or does this not make sense, do we recognise a difference between deliberate deviations from reality and accidental ones (or deviations from the established or expected reality)?

(I'm missing that ref, already seen several time, can someone explain me 😢)

For a minute there I thought the Unicode Consortium did an extremely stupid decision, don't worry guys, it's 3 characters.