What's the joke about Guanhua in Ticklish Tales Contiuned by Xiaoshi Daoren?
It seems that the The Shorter Columbia Anthology of Traditional Chinese Literature Edited by Victor H. Mair also contains the same joke.
It begins on Page 437:

and continue on page 438

The original Chinese would need to be dug up to make any sense of this translation though.

Conversation Between a Senior Official and His Subordinate
from Sequel to Ticklish Tales
Man of the Way from Smallstone
A District duty officer who had obtained his position through purchase did not understand Mandarin.10 After he took office, he paid a courtesy call upon a regional official who asked him, &quot;What are the customs like in your honorable district?&quot;
&quot;People don't cuss much there are there aren't many toms either.&quot;
&quot;How are the fingerlings this year?&quot;
&quot;Finger rings cost two hundred and eighty cash.&quot;
&quot;Are there many contributions of gentry grain?&quot;
&quot;Your servants teeth gently gleam.&quot;
&quot;How are the commoners getting on&quot;
&quot;We only have a couple of cummin bushes, but there are lots of cinnamon trees.&quot;
&quot;I was asking about the populace.&quot;
&quot;We've got lots of poplars, but they don't produce much timber.&quot;
&quot;I wasn't asking you about threes and such. What I am trying to find out about is the condition of the citizens.&quot;
Standing up hurriedly, the duty officer replied, &quot;I regret to inform you, sir, that I have a face full of zits and an arse full of wens.&quot;
10. Mandarin (&lt; Sanskrit mantrin [“counselor”]) quite literally means “language of the officials.” The Mandarin equivalent of this word is kuan-hua (official speech). Mandarin was the vernacular language employed by members of the Chinese bureaucracy who hailed from different parts of the country and, as such, spoke a variety of more or less mutually unintelligible native languages and topolects. Mandarin was based upon—but not entirely equivalent to—the language of the capital, being a somewhat refined version of the latter. This joke, which is challenging to render in English, reveals the difficulties inherent in forging a national bureaucracy from a multilingual constituency.


Apparently the original story in《嘻談續錄》is called《堂屬問答》and goes like this:

一捐班不懂官話，到任後，謁見各憲上司，問曰：「貴治風土何如？」答曰：「並無大風，更少塵土。」又問：「春花何如？」答曰：「今春棉花每斤二百八。」又問：「紳糧何如？」答曰：「卑職身量，足穿三尺六。」又問：「百姓何如？」答曰：「白杏只有兩棵，紅杏不少。」上憲曰：「我問的是黎庶。」答曰：「梨樹甚多，結果子甚小。」上憲曰：「我不是問什麼梨杏，我是問你的小民。」官忙站起來答曰：「卑職小名狗兒。」