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Disney's 'The Hunchback of Notre Dame.' The changes were not too bad- in the film, Phoebus is a bit full of himself but he's not a heartless cad and genuinely loves Esmerelda. Fair enough change for kiddies because the original would be too complicated and in the context of the film, the Phoebus thing works.
Another, rather strange, change they made was to bump up Frollo's age. In the book he is 37 but looks bad for it, but in the film Frollo looks exactly the same age in the 20 year flash back and is probably fifty-something. Esmerelda's age might have gone up slightly, to about 18 or 19, but there is still a major creepy factor. There's a lot more complexity to Frollo and Quasimodo's relationship in the book (indeed, Quasi is deaf and barely able to communicate in the book) but the relationship they have in the film is believable and powerful.
Last one I'll mention, the most suitable change they made, was to make Frollo a judge in the film (he's a priest in the book). The celibacy would have gone way over the kiddies' heads and scaring them with evil priests would probably confuse them. Being a judge, it makes Frollo's hypocrisy very clear to children, so as a parent you can point out the theme and the child might actually understand it ('who is the monster and who is the man?', as the first song of the film asks)