These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Genius Bonus: In-universe, a few characters get Polly's references to the folk song "Sweet Polly Oliver" when creating her male alter-ego (although those that do are already smart enough to have figured her out anyway).
Anyone familiar with the quotation which the title refers to will probably figure out that all the recruits are women fairly early on.