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.
What Do You Mean, It's Not for Kids?: Understanding Comics, Making Comics and Reinventing Comics each have a cartoony, kid-friendly art-style, but all 3 books tackle complex ideas about artistic theory that most people below a certain age would likely find boring and/or overwhelming. Oh, and Understanding Comics has a random picture of a naked clown lady.
Much like comedian Bob Saget's stand-up work was more mature than his televised work, McCloud's online comics are noticeably more adult than his printed comics. People only familiar with the latter might be very shocked upon their first visit to his site.