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One relevant difference is that a better-quality human answer is correlated with certain "tells": correct formatting and grammar, longer answers, higher reputation. An incorrect LLM answer looks (from the outside) exactly the same as a correct answer.

- AI answers are much easier and faster to produce thus it's going to produce a lot more wrong answers by sheer volume.

- AI answers are grammatically correct and verbose so it looks like the poster put effort into it which deceives people into thinking the answers is more trustworthy than it is.

Barring trolls, humans (for the most part) only answer if they think they're right, and the more effort put into the answer the more likely they don't get it wrong.

Obviously there are exceptions but human-wrong answers tend to be more subtly wrong whereas hallucinated answers are just baffling and nonsensical.