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 Horror: The bodies of Whitman, Price, and Haddad ("Last season's winners? No, last season's losers.") could be an inversion of Fridge Horror, as it's unlikely that those three were innocent like Richards, who was an exception to the show's "no political prisoners" arrangement with the justice system. At least if they're Released to Elsewhere, they've not been set loose to resume whatever crimes got them the death penalty in the first place.
One of the possible prizes is a "trial by jury" so we can infer that prisoners rarely if ever get a fair trial. It's also likely that even if the contestants actually got the prize, any jury would be biased against them and send them back to prison. Quite frankly, no one would ever get out even if the contest were fair.
Killian has a video broadcast of Captain Freedom fighting and killing what appears to the in-universe audience to be Richards and Amber - it's actually stunt doubles with the two characters' faces digitally superimposed over the doubles. A radical notion in a late 1980s film, but common practice by film effects artists today. Even a few years after The Running Man was released, the effects team for Jurassic Park would use the same technique to cover up a stunt double's face.
The fistfight between leotard-wearing Jesse Ventura and Arnold Schwarzenegger is much funnier, knowing that they have each since become U.S. Governors.
The movie may have been an escapist action flick starring The Governator, but it (in its own way) taught about the negative aspects of completely turning off your brain in favor of pure, violent escapism, how soul-destroying humanity's bloodlust can be, and the need to question the version of reality that TV presnts. It also teaches about the value of tenacity and standing up for yourself. As well as to not believe everything you see on TV.
Woolseyism: The Mexican Spanish subbed version has the He was Sub-Zero, Now, just plain Zero! line changed. In that translation, that line was changed to Aqui esta Sub-Zero, Ahora es un cero a la izquierda, Being cero a la izquierda a Spanish phrase meaning "worthless".note It literally means a zero to the left, after the mathematical term to use a zero before a decimal point, who normally doesn't mean anything, hence the phrase The Mexican Spanish dub left the original phrase translated literally from English.
Another odd change in the Mexican Spanish sub, and also overlap with Unusual Euphemism despise that subbed version used more profanity than the original English version replace Amber's insult to Dynamo Dickless moron to Eunuco (Spanish for Eunuch) While Eunuch has the same meaning as in English in Spanish, in the Mexican dialect it's also a antiquated synonym for baby, as she's basically calling him an inmature asshole in his face.
Again with the Mexican Spanish sub: When Richards sends Killian to his death the You Bastard! Drop Dead! line became ĦHijo de puta! ĦMuerete! (You son of a bitch! Die!). On the other hand, the Mexican Spanish dub translate the phrase more or less literally.
Harsher in Hindsight: The ending where Richards flies the plane straight into the Games Building brings up some unfortunate connotations for those reading the book post September 11th, 2001.
Hilarious in Hindsight: Richards' video camera and blank tapes together weigh about six pounds. And fit into a coat pocket without a bulge.
Moral Event Horizon: The book makes it clear throughout that the cops in Running Man's world are not exactly very nice people, but what sends them clean over this is when they try to take down both Richards and the innocent civilian woman in the car with him. One who was just begging them not to shoot
What Do You Mean, It's Not Symbolic?: The book mocks reality television show like Hard Copy that demonize people to make the audience hate them. (And keep in mind, this was written nearly 20 years before Survivor and Big Brother spared a boom in just that type of reality game show.)