Apostrophes … sometimes aren’t.
This occurs quite often. For example:
P. 11 INVASIVE SPECIES
– “…you can’t just scrape ‘em
off your shoe”—should be “…scrape ’em
” with an apostrophe before “em” rather than an opening single quote. It's hard to see in the forum font, but more obvious in the PDF:
In the same section, some words use what look like prime symbols “'” and others use apostrophes “’” to mark contractions. Again, this is more obvious in the PDF than in the forum font. See the difference between "there's" and "all’s" in this screenshot:
P. 13 LIFE AFTER THE CORPS
Similarly, various characters are being used as apostrophes here too. Compare "you’ll”, “won't”, “they’ve“, and “isn't” in this screenshot:
Is it a big deal? Certainly not! Is it worth someone spending a few minutes to impose consistency? That's up to you, Tomas!