When differences between parts that remain faithful to source source and changes in adaption cause figurative cracks in the overall story structure.
This trope is a important reminder that when you make a change to a story, you have to consider the whole story. And that some changes require a rewrite from the ground up, and frequent enough to deserve its own page. There isn't many examples where I have experienced multiple adaption versions of one story line, and of them, a good number were done well, like Lord of the rings. But many examples of movies I have watched that I know come from books, where impressions of this trope have come to me, where movies not from another source that I know of, tend to not have this issue. Movie "Ant bully". I have never read the book it is based on (and it has been a long time since I have seen this movie) There is a ant character who randomly hates humans, watching the movie that bugged me how there is no motivation for this. Having seen a deleted scene of his past where many of his fellow ants and his hive were killed my pesticide by the exterminator villain, him barely surviving, which I am sure was in the book, the character was fleshed out for me alot more. But I know I have seen more extreme examples of this, where the reason for someones future actions were omitted or changed, but the actions were not. To give a fictional (as in, this is no movie or book I know of, and admittedly extreme) example to show what I mean since I struggle to find a good real example to show what I mean.- In original source, Joe was attacked and abandoned by his mom who use to be very loving, but who was actually possessed by a demon. He survives, in part thanks to the church that adopts him, growing up to be a exorcist looking to find his mom and save her from her demonic possession. In the adaption, Joe never leaves the custody of his mom and she isn't possessed, instead she is rich, and travels the world alot, leaving him home alone with paid servants. Joe still grows up to to be a exorcist searching for his mom, who just happens to get possessed eventually. So this fictional extreme example, the background story is radically changed, but many other things in the future from source are left the same, which can lead to many of said actions and outcomes suddenly not making nearly as much sense. Then a sequel 2 adaption comes out based on further story from source, yet it wants to be consistent with sequal 1 too. These inconsistency between changes and source grow as things go on, becoming ever larger cracks in the storyline with further adaptions or sequels. Which is one of the bigger differences between this and http://tvtropes.org/pmwiki/pmwiki.php/Main/AdaptationInducedPlotHole or http://tvtropes.org/pmwiki/pmwiki.php/Main/AdaptationExplanationExtrication. This also can be much more subtle then a plothole, which can allow it to be more destructive too.
- spoiler alert*
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