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.
YMMV: Earth vs. the Flying Saucers
Special Effect Failure: Averted with the Flying Saucers, but definitely the case when the characters run endlessly against a backprojected burning forest.