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: To Have And Have Not
Adaptation Displacement: As mentioned, this is based on one of the (considered) lesser novels of Ernest Hemingway, and though the movie changes a lot of it, it's better remembered than the novel.
In 1950, there was a more faithful movie version called The Breaking Point, with John Garfield and Patricia Neal, that was well received, but isn't as well known today.
Memetic Mutation: "You know how to whistle, don't you Steve? You just put your lips together and blow."