i was only able to partially salvage this thread. i'm going to list by production, since there are overlaps from different contributions. please add to this discussion!
陆小凤传奇之绣花大盗 Clan of Amazons 1978 - lu xiaofeng is not married in the books
楚留香 Clans of Intrigue 1977 - the 2nd novel is completely missing - the underwater fight is missing - wuhua is not transgendered - hu tiehua is missing
蝙蝠传奇 Legend of the Bat 1978 - the girl looking for her father is a creation of the director
多情剑客无情剑 The Sentimental Swordsman 1977 - li xuanhuan does not throw daggers like ti lung: LXH does not use a fan, the daggers don't come shooting out from the fan. - the plum thief is a different person in the books, although the penchant for pink may be the same - Long Xiaoyun (the kid) is missing in the movie - the last 15 minutes is a recreation story from Shaw Bros - Li Xunhuan was riding a horse carriage, not walking, the first time he met Ah Fei - Li Xunhuan did not carry around a fan - Li Xunhuan did not shoot out the dagger from the fan - Li Xunhuan is said to be carrying only one dagger at the time - The character Long Xiaoyun (the kid) was eliminated - Lin XianEr stripped naked the first time she met Li Xunhuan, the movie obviously eliminated this scene SPOILER: - Long Xiaoyun is not the plum blossom bandit - Li Xunhuan did not use the ice sickle as dagger to kill the plum blossom bandit