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The following section contains certain punctuation errors:

“Your father, Old Humpty,” said the Hen, “was very foolish and would take warning from no one; you know what the poet said of him:
‘Humpty-Dumpty sat on a wall,
Humpty-Dumpty had a great fall;
All the king’s horses, and all the king’s men
Couldn’t put Humpty-Dumpty together again.’
So you see, he came to a very bad end just because he was reckless and would not take a hint from anyone. He was much worse than a scrambled egg; the king, his horses, and his men did all they could for him, but his case was hopeless,” and the Hen shook her head sadly.

Do I have to replace the comma after hopeless within quotation with a period and capitalize the conjunction "and"?

Kindly explain the instances where such revisions are necessary.

Also, is there any other error that mandates revision.

Comments  
jhilly89Do I have to replace the comma after hopeless within quotation with a period and capitalize the conjunction "and"?

Yes, except the "and" is unnecessary.

jhilly89Kindly explain the instances where such revisions are necessary.

You have to judge each time.

jhilly89Also, is there any other error that mandates revision.

I don't see one, but I would not use a semicolon after "warning from no one" but would start a new sentence there, especially seeing that a colon is coming up fast. Also, you have "take warning" and "take a hint" in the same context, and this calls attention to itself as deliberate variation, especially since neither one is very natural (but maybe that's just how this hen always talks). I think you mean "take advice" both times.