The notion of "change for the sake of change" exists only in the eyes of those who dislike or disagree with the changes, but it's never the goal of whoever made the change in the first place.
Mouse, Mouse, Mouse! I can think of several examples, but I'll just pick one.
Did you ever watch the Sci-Fi miniseries version of
Earthsea? It had some of the most obvious and least useful examples of "change for the sake of change" I've ever seen.
The main character in the book is child-named Duny, use-named "Sparrowhawk", and his truename is Ged. In the TV show, the latter 2 are reversed. That is almost the
definition of an arbitrary alteration.
The race of nearly every character in the story is "whitewashed"- only the Kargs are caucasian...yet nearly every character in the miniseries is. Again, why? You can't honestly say they couldn't find enough black or asian actors to commit to a miniseries.
And if you want to count it as another example, the Isle of Roke went from being Men only to being sexually integrated, Harry Potter style, ignoring that the dichotomy between men's magic and women's magic was an important theme in the books.
In addition, the series heaped up new characters- "The Archmagus" and "King Tygath", "Diana", "Penelope", and "Marion"- changed the terms "Karg/Kargad/Kargish" to "Kargide" and the completely excised the celibacy of Earthsea wizards when Ged and Tenar become sexually involved. (BTW, this is one of the few examples in literature in which a
male mage must take a vow of celibacy in order to maintain his power, and would lose that power if he broke the vow.)
Is it any wonder why Ursula K. LeGuin said of Sci-Fi's treatment of her work
I can only admire Mr [Executive Producer Robert] Halmi's imagination, but I wish he'd left mine alone...