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.
Les Yay: Grace gets hit on by Warrant Officer Ariel Garamond, and she admits that she is attracted to her but she claims to be not available. As more of a joke, between Grace and Rebecca note note that as an Australian officer, she would have no legal issues being "out".
Earlier in the episode, Grace claims her "appetite" for men has been spoiled by her ex-husband.