[nayuki]

> calling spelling I'd never see a "common mistake" (like "gr." for grams)

Maybe I should change the example for gram to "gm" (or "GM"), because I actually see that in Canadian supermarkets - on the price label on shelves, not on the product label.

> I saw "Set the oven to 450 K", and I realized that the examples are to be taken with a grain of salt

I mean, that example exists to reinforce why we should continue using degrees Celsius for everyday temperatures. I'm simultaneously describing what we should do and what we should not do. The statement is less impactful if I only describe the positive example without the negative.