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.
Fridge Brilliance: As a general rule, Reacher is in peak physical condition and at the top of his game. Which doesn't make sense, because he's technically retired. But he's naturally built very strongly, spends his days wandering about the country, sees action every time a story comes up, and and sometimes this is actually explicitly noted as not being enough.
Fridge Horror: At the end of Nothing To Lose, Reacher and his partner blow up the metal salvaging plant owned by the villain and his co-conspirators with their own bomb. It's poetic justice... until you consider that one of the side plots was the presence of a highly carcinogenic chemical and how small amounts of it are leeching into the water supply not to mention the main plotline that the villains were building a dirty bomb packed with depleted uranium. Congratulations, Reacher, for creating an environmental disaster site.
Marty Stu: Reacher can tend this way at times - it's particularly pronounced in those volumes of the series which are written in first person.
Padding: Child can get pretty obsessive about cataloging every single facet of a character's appearance, or a room, regardless of anything important to the story.
Harsher in Hindsight: The movie starts with The Dragon sniping five innocent bystanders. Then came Sandy Hook Elementary School massacre, forcing the movie to delay its red carpet premiere.
Narm: Might be the only time you'll hear someone in a modern film actually say, with no hint of irony, "I'm not a hero. I'm a drifter with nothing to lose."
Nightmare Fuel: Werner Herzog as the Zec manages to be completely terrifying despite not really doing anything but talk for the whole film. All he has to do is be himself, the Crazy Awesome director who seriously considered an offer to kill his lead actor, made a film on an active volcano, and ate one of his shoes.
One-Scene Wonder: Robert Duvall as the one guy in the world who can converse on Reacher's level.
Tainted by the Preview: Fans of the books were livid about Tom Cruise's casting, as he looks absolutely nothing like the Reacher of the books (most notably, Reacher is huge, and his size is often an important part of his characterization).