Concerning Shakespeare's Hamlet, and the passages you ask about, I've never heard or read anything that suggested anything "unusual" about the speech itself. I think I know what your question is getting at, though.
When Hamlet requests the 1 Player to recite the speech (Act 2.2.407-420 in my edition, but my edition is slightly different from yours) he says that the play the speech is from was never performed, or if it was it was only performed once, because it had no popular appeal.
I heard thee speak me a speech once, but it was never acted, or if it was, not above one, for the play I remember, pleased not the million; 'twas caviary to the general [was for the connoisseur, not the masses].
If your question comes from your teacher, I think that's probably what he/she is looking for. Read the passage in its entirety, checking the notes provided, and you'll find that the play the speech is from, though not for popular consumption (it was not vulgar enough, for one thing,...
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