The character Gung Sheun Luk Ngok provides an interesting continuity problem in L/ROCH.
Gung Sheun Luk Ngok is supposedly younger than Yeung Gor: she looked younger, acted younger, and called him "Yeung dai gor" ("big brother Yeung.") If you do the math, however, she should be older.
Gung Sheun Luk Ngok's mother, Kau Cheen Chek, was nowhere to be seen in LOCH although her two brothers were seen prominently. That means that the incident in which Kau Cheen Chek's husband, Gung Sheun Tze, crippled her limbs and abandoned her to die in the cave beneath Passionless Valley must have happened even before Gwok Jing and Wong Yung's encounters with the Kau brothers in LOCH.
Yeung Gor, however, wasn't born until towards the end of LOCH.
Moreover, how was it that Gung Sheun Luk Ngok was alive and active at Passionless Valley in ROCH anyway? Her mother had been crippled and abandoned in the cave while supposedly still pregnant with Luk Ngok. Nobody, not even Gung Sheun Tze, had gone down there to see Kau Cheen Chek during the two decades she was down there. She did not give birth to Luk Ngok in the cave and have Gung Sheun Tze or somebody else bring the baby back to the surface. By all rights, Luk Ngok should have died in the cave (or survived and somehow grew up in the cave).
Gung Sheun Luk Ngok's very existence is a continuity blip.