I'm not an expert at Chinese (so please point out the errors), but I think he missed a few:
10. Hanyu Pinyin (which is the one everyone uses) overloads every second letter, to make it more condensed.
r = r, or zhr, tchzr, or something like that (it's up to the speaker)
j = zh (kinda), as in Beijing
zh = j (WTF? Are they trying to make things hard?)
z = ts
c = ts ... but a different ts to z. (aspirated)
q = tch
x = tsh
none of which should be confused with ...
ch = ch (dark)
sh = sh (dark)
s = s
That's about it for consonants. Remember to carry a pack of tissues.
11. Then there's vowels. Don't get me started. There's lots of vowels, and getting them wrong will completely change what you said.
12. Idioms. Though this relates to number 9 - cultural differences, and I guess it's an issue in all languages.
13. Regional dialects. Every village has it's own language, which isn't really comprehensible to anyone else. You can speak Chinese, and still not be understood, simply because you are talking to somebody who doesn't know putonghua (standard).
Chinese has some advantages. It's rare to run into sesquipedalian loquaciousness, if only because few people can be bothered learning all the synonyms. There are synonyms (of course), but they just don't seem to get used as much as in English.
- I can only thing of one way to say "big" in Chinese. In English, there's "big, large, enormous, huge, gigantic, gargantuan, grand", and about a dozen others. In Chinese, if something is big, it's '大 (da)', or maybe 'very big'. Except the great wall, which is the "long wall" (not big).
- If something is "good", it's "好 (hao)", or "really good", or "very good", or "double good" or possibly "佳 (jia)". Not "good, excellent, splendid, magnificent, superb, superlative, wonderful, fantastic, marvelous", or anything else your third grade teacher said about the short story that even you knew was crap.
The best way I've found to learn a little Chinese is to get a idiom dictionary, and look up idioms. You learn interesting stuff about the culture (lots of food and trade analogies, mythology, nature, and some analogies to bodily functions that are so visceral Kevin Smith used one in Clerks), and it's a good way to practice common words.
But yeah, it's not easy.