There's an interesting example of this in the literature, Poul Anderson's _The Broken Sword_ --- when it was re-printed later in his life, the author felt obliged to touch it up some, improving the sword-fighting scenes (he'd spent decades of his life since writing the original participating in the S.C.A.) and removing the appearance of a being, replacing him w/ an impersonator (another character from the story). Recently the original was re-printed, and I've been meaning to find time to read it in a close comparison w/ the touched-up version I read.
Also, C.J. Cherryh chose to markedly change the ending to her _Dreamstone_/_Tree of Swords and Jewels_ duology when it was re-printed --- I've consciously chosen to not track down the newer version, 'cause I'm worried about it detracting from the very moving / poignant original.
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