The next time someone tells you something is the "least worst option", tell them that their most best option is learning grammar. Besides the fact that the double comparative/superlative had a long life in English ("the most straitest sect of our religion", Acts 26:5, KJV, for example), this is obviously playful, not ignorant.
To "wait on" instead of "wait for" when you're not a waiter - once read a friend's comment about being in a station waiting on a train. Yes, to "wait on" also means to be a waiter, but writers from Chaucer to Milton to George Eliot used "to wait on" in various senses including "to observe", "to lie in wait for", "to await" and more.
Transportation. What's wrong with transport? Nothing. What's wrong with transportation? Brits prefer "to orientate oneself", Americans prefer "to orient oneself". Not worse, just different.
What kind of word is "gotten"? It makes me shudder. It is the original past participle, from old Norse getenn, now obsolete in English English, but surviving in America. Participial "got" is the newcomer.
"I'm good" for "I'm well". That'll do for a start. That'll do what? Linking verbs including "am" take adjectives, not adverbs. "I'm healthy," not "I'm healthily." There's nothing wrong with "I'm well", since "well" is also an adjective, but nothing wrong with "I'm good" either.
"Oftentimes" just makes me shiver with annoyance. Fortunately I've not noticed it over here yet. The OED cites six hundred years of British usage of "oftentimes", including the King James Version and Wordsworth.
"Hike" a price. Does that mean people who do that are hikers? No, hikers are ramblers! And words sometimes have multiple meanings!
Going forward? If I do I shall collide with my keyboard. If you cannot understand metaphorical language, colliding with your keyboard is the least of your worries. A visit to the neurologist may be in order.
The most annoying Americanism is "a million and a half" when it is clearly one and a half million! A million and a half is 1,000,000.5 where one and a half million is 1,500,000. By that logic, could "one and a half million" not be 1 + 500,000, or 500,001?
That's enough peeving on peeving. Many of these are truly Americanisms, and many are (to my eye) annoying, too. But so many share one or more of these features:
1) selective hyper-literalism: refusal to understand idioms as such
2) amnesia, or else the "recency illusion": A belief that something quite old is new
3) simple anti-Americanism: the belief that if something is ugly, it must have come from the states
Since Matthew Engel and the Beeb's readers had so little trouble spouting dozens and dozens of "Americanisms" they dislike (the BBC closed comments after 1,295 had arrived), and since such a high proportion seem to be false Americanisms, I propose that this is a common thing, and thus deserves its own count noun. We all know what Americanisms are. From here on, Johnson will refer to false Americanisms used to take a cheap but ill-aimed transatlantic shot as "Anti-Americanisms".