Ass Pull: Harry is shown to have suddenly taken up smoking at the exact moment the story needed someone to unintentionally light up the alien fluid in the petri dish in order for the heroes to learn about heat/fire being the evolution catalyst for the aliens.
After the space monkeys got napalmed, they all integrated into one giant cell that wasted no time beginning to divide, meaning that the napalm caused the evolutionary process to start all over, but on a MUCH bigger scale. If the single post-napalm alien cell was as big as it was, imagine what the end result would've been. Can you say "space monkeys the size of Russia"?
For double the horror, imagine if Woodman had actually gotten his way and been allowed to pop off a nuke.
For what it's worth, it's not practical for a single animal to be that big since it would be impossible to maintain its metabolism, and the creatures would probably have rapidly evolved to be smaller - but not before wiping out the larger part of America. And since they'd already waded through the evolutionary ladder once, they'd probably be much tougher too.
Another aspect of Fridge Horror is the fact that at the beginning of the movie we see the asteroid break apart on re-entry, where did the other pieces land?
Narm: The last few chapters of the book crank up the nihilism while throwing in some bizarre predictions of future evolution, leading to unintentional hilarity. To wit: robots eat Mars, giant invisible salamanders roam the Earth, and the descendants of humanity get wiped out by trees with mind-control powers.
One chapter attempts, with complete seriousness, to describe how grass is a sign of how humanity has damaged the planet. Grass.
Squick: Apart from the constant, vivid descriptions of excrement and erections, we also have the rape of a 12-year-old Neanderthal girl.
For the video game
Polished Port: The game's main characters have better character models based mainly on the second game's character models. However...
Porting Disaster: Not as bad towards the second game port but the problems are really shown in the first. Including things as, levels being reskins of the second game's Bonus Dungeon, less bosses, easier bosses, less Cyframes parts, and Pannam Town being cut down including Chain's mobile and the bar Pepper hangs out at. Not only that, but a number of animations (due to using the majority from Far Off Promise) and outright cutscenes were chopped off the first half.
That One Boss: Yurka can be a really surprising brief Difficulty Spike when first fought. He has blinding attacks that affect 2X3 squares, has an entire party hit skill, and his normal attacks can possibly deplete half health or more. The only attack that doesn't work too much is his health absorption.
Even though he's not longer eternally five levels higher, Eugune can be this depending on what party you take. Attacks that do high damage, a party wide attack, there are not many opportunities to grind during the first half alongwith the other problems (see Porting Disaster) and your healer is kidnapped meaning you'll primarily be relying on items.
Viewer Gender Confusion: Chain is a girl. Her appearance and -to a lesser extent- the voice acting do not help at all. Even Mag kind of lampshades this in the very beginning.
For the Professional Wrestling stable
Awesome Music: Jim Johnston's "Line in the Sand", interpreted by Motörhead, a mid-tempo piece with introspective lyrics. This being Motörhead, the song sounds as badass and headbang-inducing as anything they did on their own.
Badass Decay: Against The Shield as a whole. Evolution themselves have never been able to handle them in straight brawls, constantly outmaneuvered by them, and tends to rely on having several people help them or jump The Shield first before doing anything. And even that sometimes doesn't work. Throughout the entire storyline, despite what their new creed is, they've failed to actually live up to it until Hunter launched Plan B and had Seth Rollins turn against his brothers.
Fanon Discontinuity: Many fans would like to believe that the storyline in which Triple H proclaimed Eugene a member of Evolution never happened. Not only because the very premise of Eugene being a member of Evolution was freaking ridiculous (and Trips indeed only did so clearly as a rib to mess with Eugene), but because this was the beginning of Eugene (who up until then was getting bigger pops that the main-eventers) slowly transitioning to jobber status.