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In a text, I saw a comment to the effect of:
Да она хорошенькая, нечего сказать!
(I believe this was meant to be sarcastic, given the context.)
Then in another passage, I saw:
Хороший он человек, нечего и говорить!
Is there a difference between these two, or are they interchangeable?
In many (or even in most) cases (apart from the sarcastic usage coverad by @Annix) нечего сказать and нечего говорить are synonymous, meaning "there's no doubt", "there's nothing to discuss." Both of your sentences can be examples of this synonymous usage.
On the other hand, сказать implies one person speaking ('saying'), and говорить implies one ore more persons talking ('talking', 'discussing'), so Да она хорошенькая, нечего сказать! can mean "She's beautiful, I can't argue with that", and Хороший он человек, нечего говорить! can mean "He's a great person, no question."
Нечего сказать in this sentence may be sarcastic or not, it expresses slight surprise of the speaker about the said fact "I have no words".
Нечего говорить here may be either somewhat unusual (and possibly not too correct) synonym to нечего сказать or it may be contraction from "нечего тут и говорить" meaning "here is nothing to argue about", expressing belief in the fact possibly contrary to the possible opponent's scepticism.
хорошенькаяshould be there,хорошенькаis not a Russian word, such form is never used.