Mystery Science Theater 3000 had on-and-off trouble with this, due to the format of the show: they had to trim out questionable content and pare down the films they riffed so that, in combination with the host segments, the show would only fill roughly 90 minutes of run time (in a two-hour time slot). The show's staff stressed that they tried not to artificially add to a film's poor quality with their edits, but it occasionally happens.
The catastrophic Joe Don Baker vehicle Mitchell was 97 minutes long, but was cut down to 70-75 minutes. One of the things cut out was the death of John Saxon's character Mr. Deaney, one of the film's primary antagonists. Despite what some MSTies have mistakenly assumed, though, Best Brains was not responsible for this one; the scene was already trimmed from the Lorimar TV print of the film they chose for riffing (explaining why they joked about Saxon's absence, as they don't pick on a movie for cuts they themselves made to it).
This was actually averted in Sidehackers. One of the scene that had to cut out due to content involved the hero's girlfriend being brutally gang rapedand killed by the antagonist and his lackeys. In order to explain why the main heroine suddenly disappears halfway through the film, one of the bots makes the following remark.
Crow: "For those of you following at home, Rita is dead."
The deletion of Neville Brand's character from Angels Revenge causes a number of plot holes to crop up — namely, why the female officer is part of the group, why the police never appear involved, and what did the girls do with all the cocaine they snagged at the beach.
The TV adaptation of Going Postal skips the subplot about what happened to the previous postmasters by revealing they were killed by Reacher Gilt's banshee assassin. However, the only reason the Post Office is standing in the book is that Gilt doesn't see it as a threat; as soon as he does, he doesn't mess around killing postmasters, he burns the place to the ground. In addition, a rearrangement of scenes means that TV Gilt has to kill Horsefry personally, when the man is visiting his office, rather than employing the hard-to-track Mr Gryle to swoop down and kill him in his own home Despite the TV version retaining Ankh-Morpork's capable and determined Watch (and its bloodhound-like werewolf), this crime apparently goes unsolved.
Talking of the Watch, Angua twice arrests Moist for breaking his parole by leaving the city, but for some reason there was no problem earlier when he took a horse to Sto Lat. (In the book, it's made clear he can leave the city as long as he's on Post Office business, which applies all three times.) It's also not clear why this is even Angua's job; Mr Pump is still his parole officer, and collects him when he actually tries to escape.
Cackles Academy has a fair share of teachers that aren't seen and don't come into the story that much but the TV series shows that there are only four teachers at the school - Miss Cackle, Miss Hardbroom, Miss Bat and Miss Drill - yet in the second season a Miss Gimlett is mentioned as being the Year Head for the 2nd year girls but has moved away over the summer. Miss Gimlett was never mentioned or referred to before that episode and apparently never used the staff room. In the books we didn't know what Miss Gimlett taught since the only lessons the girls were ever shown having were potions and chanting but the TV show has Miss Cackle teaching spells and no other subjects, apart from PE so that begs the question what did this elusive Miss Gimlett teach before she left?
Similarly the second season follows the third book's plot of having Mildred and Ethel banned from the Halloween celebrations after what happened last year. When the Grand Wizard sees Mildred he says straight from the book "are you not the girl who ruined the Halloween celebrations last year!" which creates a Plot Hole. In the previous season, the episode "Sweet Talking Guys" added an original plot where the Grand Wizard visits the school with some apprentice wizards and ends up impressed by Mildred during a public speaking contest. So why would he have a problem with her being at the Halloween celebrations? Especially when he doesn't reference them at all in "Sweet Talking Guys".
The same episode otherwise abverts this. Griselda Blackwood's only appearance in the books was Mildred tying her up and going to the Halloween celebrations in her place. In the TV series however, Griselda is expanded into one of Mildred's friends so keeping this intact would have created a Plot Hole. So this role is given to Drucilla instead.
The Halloween Episode keeps the book's plot point of having Miss Cackle and Miss Hardbroom not believing Mildred's story about the wicked witches' attempted invasion. They only start to believe her when Mildred mentions a woman that looks like Miss Cackle - and the latter reveals she has a twin sister. This works in the book because Mildred had turned the witches into snails and thus couldn't prove herself. But in the TV show, she just shrinks them - so you have to wonder why she doesn't open the box immediately so that the two believe her. Additionally Miss Drill has been involved in the TV series, rescuing Mildred from the woods. So the other teachers should have no reason not to believe Mildred with a member of staff vouching for her. What's more is that the witches got inside the school in the TV show and Miss Cackle got turned into a frog.
Similar to the Miss Gimlett example above, the Two-Teacher School element creates minor plot holes in various episodes. With Miss Cackle, Hardbroom, Bat and Drill as the only teachers - there are plenty of instances of one teacher taking Mildred's class, and the other three wandering freely around the school. So who is taking the classes for the other years?
Inverted in one case where the book had a Plot Hole that the TV series fixed. In the first book Ethel is turned into a pig by Mildred but can still speak and so rats her out to Miss Hardbroom. The Plot Hole comes in the third book when Ethel turns Mildred into a frog and Mildred can't speak to humans. In the TV series Ethel can't speak at all when she is turned into a pig, fixing the plot hole.
In the book, Alice tells the Blue Caterpillar that she was attempting to recite a poem earlier, but the words came out wrong (she does this while she's in the hall of doors). But in the movie, Alice didn't do this, making nonsense out of the line where she tells the caterpillar she did this.
In the book, Alice first sees the Cheshire Cat in the Duchess's house. In the movie she first sees him after she's left the house. Later when the Cat appears in the sky at The Queen of Hearts's croquet ground, Alice tells everyone that she thinks the Cat belongs to the Duchess. But Alice didn't see the cat at the Duchess's house, so how would she know?
When Alice starts growing at the Queen's court, she protests that she hasn't eaten a piece of mushroom or drunk anything. The problem is that in the movie's scene with the Caterpillar, Alice didn't learn what it was that would make her shorter or larger and just walked off without any mushroom after the caterpillar vanished.
The Walking Dead accidentally created a Plot Hole in the Governor's motivations due to the way Woodbury was depicted. In the comics, Woodbury was not well equipped to handle the Zombie Apocalypse and the Governor desired to move his people to the much safer prison. The TV series reversed this, making Woodbury a sanctuary and the prison less secure. This makes the Governor's vendetta against Rick's group seem rather pointless, especially given that he was fairly reasonable in his first encounter with Michonne and Andrea. He did eventually get a more plausible reason for his hatred -Revenge on Michonne for stabbing him in the eye and killing his zombified daughter- but this was only after the conflict between their groups was well underway, and it's also made clear that even if Rick handed Michonne over to him as a peace offering, he'd destroy the prison anyway For the Evulz.
Season 4 has attempted to fix this, after the first assault on the prison fails the Governor kills most of his followers and burns down Woodbury in a rage. However, after he meets Lilly Chambler and her family and bonds with them, he once again begins seeking a safer home, and with Woodbury gone he's set his sights on the prison.
The initially disproportionate personal vendetta goes for Michonne too. In both versions of the story, Michonne waits, sword ready, in the Governor's quarters with the intention of settling a personal vendetta alone and where she could take her time with him. In the TV series this seems a bit unwarranted for a man that she knows as an affable leader she herself does not trust, who may or may not have been behind Merle's orders to follow her unsuccessfully and coerce strangers back to Woodbury. In the comics, Michonne's personal vendetta stems from the Governor having restrained and repeatedly raped her, and tortured and maimed her companions. While her destruction of the Governor's eye was not done through torture in the show, it was clearly along the lines of her intentions when she waited for him in his room, despite her not having nearly as much cause for such brutality as her comics counterpart.
Some Power Rangers installments will cut elements of the source sentai they either don't need, don't fit the story/setting at hand, or the American censors don't like. But as a result of using sentai footage, artifacts often show up out of nowhere (such as the Rangers wielding weapons they hadn't been using), and either aren't acknowledged at all, or else, they try to explain it away:
Mighty Morphin' Power Rangers might leave some older viewers scratching their heads at the fact that the Rangers all have Zords and costume emblems based on dinosaurs, even though they got their powers and equipment from Zordon—a wise alien trapped in a time warp, who has no logical reason to be interested in extinct creatures from Earth's past. For that matter, how the hell does Zordon even know what dinosaurs look like? And if he's from another planet, why does he have a Command Center on Earth with a stasis tube to contain his consciousness? Well, in Kyoryu Sentai Zyuranger, all of those things made perfect sense. The Rangers' mentor was an immortal human wizard named Barza, the Rangers themselves were warriors from an idyllic past when humans and dinosaurs lived in perfect harmony, and their vehicles were gifts from a race of godlike beings who took the forms of animals. The American redub replaced Barza with Zordon and cut out the prehistoric backstory, but forgot to explain why the Rangers and their mentor were obsessed with dinosaurs.
A comparatively minor one occurs in The Lost Galactabeasts Part 2. The Rangers learn the Galactabeasts won't attack the Brainwashed and Crazy Stratoforce and Centaurus Megazords because they are the missing Phoenix and Rhino Galactabeasts and the other Galactabeasts won't attack family. Yet the Torozord, who is unrelated to the Galactabeasts, refuses to fight too. That's because it is related to them in Gingaman, where it is classified as a "Heavy Starbeast."
Plot Holes can also happen due to Power Rangers adapting a Sentai's episodes Out of Order. For instance, Power Rangers may adapt a Sentai episode where the Rangers fight monsters Back from the Dead, even if some of them never appeared in Power Rangers. The Lightspeed Rescue episode, Sorcerer of the Sands is one such case, with two monsters (Treevil and Arachnor) appearing in later episodes.
Probably the biggest is that Jayden and Lauren being siblings messes up the twist at the end quite a bit. In Shinkenger, Takeru is a Body Double for Kaoru and wasn't a real Shiba, thus his reasons for not wanting the other Shinkengers to fight with him is based on his feelings that they shouldn't risk their lives over a lie. The omission of a direct counterpart to Tanba also cuts out much of the tension between Kaoru/Lauren and the other Shinkengers/Samurai Rangers, while Lauren is also much friendlier than Kaoru was (at first, anyway), so their rejection of her is very forced by comparision.
A smaller one is the much maligned decision by Mentor Ji to take Antonio's morpher away. While it does happen in Shinkenger, Jii does have much stronger reasons for doing it. Namely that Genta is an even bigger doofusnote Genta showed up at the Shiba household looking like a ridiculous Samurai caricature and generally wasn't taking things seriously despite insistence's to the contrary. than Antonio is, and the Sushi Changer was at least partially created using the power of both the Octopus Origami and a Hidden Disk that Takeru had given him, so Jii at least is taking back something that rightfully belongs to the Shiba household because of its origin. The omission of the tinier details causes the scene to take on a very different tone than the original, making Mentor Ji out to be an Elitist Jerkass rather than well intentioned but harsh.
In particular, one episode has the Blue Ranger losing to a sword-wielding Monster of the Week, suffering a major hit to his pride, and undergoing Training from Hell to defeat the monster. This makes perfect sense in Gokaiger, since its Blue Ranger is a swordsman with a lot of pride in his skill, but since Megaforce's Blue is a Hollywood Nerd, he ended up adopting Gokai Blue's personality for the duration of that episode just to make the plot work, then reverting back to normal for the rest of the series.
In "In the Driver's Seat," the rangers go to Corinth. The problem with this is that they heavily reuse the stock footage from the GokaigerGo-Onger tribute, thus part of Corinth becomes a raceway for no reason and the Turbo Falcon Zord had no other reason for what it was doing than just because. In Gokaiger, it was rebelling against its parents, then stopped when it became a pirate with the team.
On a minor note, Noah gets singled out by Argus for no reason. In Gokaiger, Argus' counterpart, Barizorg, is a cyber converted version of Joe's old mentor, Sid, and thus Joe is on a personal vendetta to free Sid's soul from being trapped inside Barizorg, since his skills are being used by the wrong people. Noah fought Argus because Argus had no one else he wanted to fight, I guess.
Promoting Goseiger'sDisc-One Final Boss Mons Drake into Megaforce'sBig Bad Admiral Malkor was a good case of Adaptation Distillation. But when the Rangers face him in The Human Factor, they neglect to make use of the Ultra Mode or Gosei Ultimate, both of which would have been handy against Malkor. Their Sentai counterparts were introduced after Malkor's tenure as Big Bad, but unlike Robo Knight's subplot, there's no reason for their absence.
The show also adapts out Datas, yet includes the Ultra Gosei Great Megazord that he made part of. So there's no explanation for the Megazord's backpack that appears when the combination is formed.
The Age Lift done to Richard in the miniseries adaptation of The Pillars of the Earth causes a few problems. In the book, he's only a child and dependent on his older sister Aliena when they're orphaned and lose their home, which causes them a few problems due to the misogynistic 12th century society they're thrown into, like a wool trader who refuses to do business with her. In the series Richard seems to be the same age as her, making one wonder why he doesn't step in during situations like this. Then again, Richard doing something actually useful would be a huge Out-of-Character Moment compared to his portrayal in the books.
The 1980s adaptation of The Day of the Triffids has a very mild one in the very last episode. The mysterious "comet debris" that caused mass blindness and a mysterious and deadly disease that almost wipes out the survivors were attributed to malfunctioning Kill Sats in the original book, which would have been quite plausible in the early 1960s, but the Outer Space Treaty banned the placing of weapons of mass-destruction in orbit even if anyone had wanted to do so.note Turns out that once you can put a satellite in orbit, it's only marginally more difficult and expensive to shoot one down. But when the BBC adapted the show in 1981 they decided to do a straight Setting Update, without changing this plot element. They get away with it because in both versions the viewpoint character is only speculating from the point of view of a somewhat informed layman, and what actually happened is left ambiguous.
"The Miserable Mill" story is changed so that the Baudelaires arrive at the titular mill after running away and are taken in as illegal employees by 'Sir' (the owner), rather than being assigned to him by Mr. Poe as they were in the book. This was probably done for pragmatic reasons, as it is hard to believe that even someone as stupid and incompetent as Poe could think assigning orphans to work at a lumber mill would be acceptable, but it does make Count Olaf's Evil Plan rather pointless in the TV show. Olaf, disguised as "Shirley T. Sinoit-Pécer" tries to convince Sir to pass the children into his care by hypnotizing Klaus and making him cause an accident. As Sir has no guardianship over them in the show, he cannot legally sign them over to Olaf, and if Olaf merely wanted to kidnap them he didn't need Sir's permission to do that.
The VFD subplot being integrated into the show much earlier than it was in the books has also caused some issues. For example, in "The Reptile Room", Uncle Monty mistakenly believes "Stephano" is a spy from the Herpetological Society rather than Count Olaf in disguise. This made some sense in the books, where he had no real reason to suspect otherwise (beyond the children trying to warn him, but Not Now, Kiddo is a staple of this series) but not in the show when he's receiving secret messages from the VFD about the children being in danger.
"The Hostile Hospital": Show viewers might be scratching their heads at how Olaf could have possibly believed Klaus would ever go through with sawing off Violet's head. In the books, this happened because Klaus had taken a disguise intended for the White-Faced Women (who unbeknownst to Olaf hadn't yet arrived at the hospital). Olaf, fooled by Klaus' Paper-Thin Disguise, believed he was giving this order to one of his minions. In the show however, Klaus' disguise is a character of his own creation, and Olaf sees through it, leading to the awkward scenario in which Olaf apparently believes he can make Klaus murder his sister through peer pressure.
The Flash has a tendency to give typically villains different motivations for their actions, but quite often it ends up resulting in this:
Captain Cold/Leonard Snart in the comics was a Noble Demon at his worst who at one point retired after the death of Barry Allen and actually befriended his successor, Wally West, but in the show he was a colder and more calculating figure who willingly killed and endangered civilians just to antagonise Flash. Despite this, in the show, Barry regularly treated him as a Noble Demon, trusting him to help the team when they needed him and encouraged a HeelFace Turn, even though Snart in the show never showed any indication he wasn't an evil bastard and betrayed Barry whenever he did trust him. He does eventually go through a HeelFace Turn when he's spun-off into Legends of Tomorrow, but that's long after they've established him as a selfish dick.
Similarly, Pied Piper also went through a HeelFace Turn in the comics and became friends with Wally West, but he was never a particularly dangerous villain to begin with and, through retcons, his motivation for his crimes were simply to rebell against his upper class upbringing and later to help the homeless. The show instead depicted him as one of the most dangerous and cruellest villains who nearly killed Barry in a slow and very painful way, and explained his later HeelFace Turn as the result of an Enemy Mine situation created by Barry changing the timeline that somehow gave him a complete personality inversion.
Caitlin Snow's transformation into Killer Frost is probably one of the most egregious cases. In the comics, when she became Killer Frost she was cursed with 'heat vampirism' that forced her to lethally drain body heat from other creatures until to sustain herself, and she had to kill just to survive. In the show, this isn't the case; initially she just really wants to be normal and was willing to attack and mutilate her own friends to do it, with the show acting that With Great Power Comes Great Insanity, something that has never been the casenote though other characters that season demonstrate this issue, its explicitly the result of Savitar/Alchemy mentally attacking them and giving them the memories of their Flashpoint selves; Caitlin however got her powers completely unrelated to this.