It's not really all the relevant. However, for people that claim that the Bible is perfect and without error because, as they say, it was given by the perfect, all-knowing god, then there should be no mistake, no matter how trivial. But, as we can see, they got it wrong by claiming that beetles, grasshoppers and locusts have only four legs/feet. That is an error. Therefore, the Bible is not perfect and without error. And this is just one small thing.

They also included the bat in with a list of birds despite the fact that the bat does not lay eggs, does not have feathers, does not have a beak, but has teeth instead, etc. So even if they categorized animals differently, it would be pretty obvious that a bat is not a bird and it would certainly be known to a god that supposedly knows everything and is, himself, perfect. So, again, this little exercise simply demonstrates that the Bible is not perfect and, as a result, it could not have come from a perfect god.

And this is just one, small example.

But we see something else from this example as well. Instead of seeing the error, no matter how simple and plain it is, the Christian who believes the Bible is perfect, will try to find a way to resolve the error even if they have to twist the passage to say what it would not naturally mean. So, "legs above feet" somehow becomes back legs that aren't counted in order to arrive at four legs despite beetles, locusts and grasshoppers all having six, etc.