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.
Hilarious in Hindsight: The cover shows two people (one a typical white-coated Mad Scientist) struggling over a glowing vial while in a "Tesla ST" Flying Car (presumably in Gernsback). GURPS Alternate Earths was first printed in 1996, seven years before Elon Musk started Tesla Motors.