Factual error: The flag used when Radcliff claims the land for King James I wasn't adopted until 1801.
Factual error: The movie depicts a moose in what would be Coastal Virginia. They are not native to there at all.
Continuity mistake: When Pocahontas sees John Smith for the first time, John is climbing up a cliff face and then a tree. You can see his musket strapped to his back as he's climbing. But after he tells Thomas he's getting a better look and then is shown in the tree, his gun has vanished.
Answer: She didn't exactly hate Kocoum though. She loved John, sure, but Kocoum was someone she'd known her whole life. It's not unreasonable she'd be upset over his death, whatever the circumstances.
Phixius ★