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.
Maybe Magic, Maybe Mundane: Most of the time it's made obvious that Mona and her friends make everything up. There are, however, occasions that make you wonder. For example when Mona imagines Thor attacking before she knows that Charlie stole the miniature.