Retcons in the Fantastic Beasts and Where to Find Them franchise hurt Harry Potter canon far more than Harry Potter and the Cursed Child. Any story that incorporates events from the past into its narrative has to ensure that nothing contradicts what the present has already established. Yet the Fantastic Beasts movies, a prequel franchise, and the Cursed Child play, a time travel story, both struggled not to confuse or even directly contradict what had already happened in the original Harry Potter film series.
Fantastic Beasts: The Crimes of Grindelwald caused a lot of controversy for its clumsy, or at times even nonsensical, plot choices that created inconsistencies in the Harry Potter world. Fantastic Beasts: The Secrets of Dumbledore tried its best to correct many of its predecessor's mistakes, but other plot holes continued in Fantastic Beasts 3 that likely contributed to its underwhelming critical reception. On the other hand, the stage production of Cursed Child has been wildly successful despite its many contradictions to established Harry Potter lore.
Related: Fantastic Beasts' Failures Makes A Cursed Child Movie More Likely
The original Harry Potter movies crafted an intricate web of characters and events, making it difficult for any new addition to that story not to occasionally poke holes in the established canon. However, both Fantastic Beasts and Cursed Child have introduced an overwhelming array of plot holes and retcons that do not make much sense. And even though Cursed Child's retcons were harmful to the canon, those in Fantastic Beasts were much more so.
Both the Fantastic Beasts series and the Cursed Child play have retconned Harry Potter canon a great deal. One major plot hole throughout the Fantastic
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