Here's something no-one will probably know:
In 1807 a ship and its crew arrived in Whangaroa, New Zealand, with the intent of resupplying for a journey to England. The ship's captain held a watch up and the local Maori thought it was something sacred, so when the captain dropped it into the harbour (simply because he wanted to wind the Maori up, no less), the Maori forsaw an omen. Coincidentally, the ship's crew were carrying Influenza which spread to the Maori, killing roughly 60 people.
In 1809 the son of a Maori chief was aboard the convict ship Boyd. He was referred to as George by the ship's crew and had sailed from Sydney Cove to Whangaroa in New Zealand in October 1809. The ship was carrying 70 passengers having just dropped off convicts to Sydney and was on its way back to England via New Zealand.
On board, George refused to do his fair share of work because his culture dictated that he should be telling everyone else what to do, and therefore he was flogged for it.
When the ship arrived in Whangaroa in October, George was escorted back to his tribe, which then demanded retribution for the influenza victims (which of course they thought was because the captain had dropped the watch in the harbour) and killed 66 people aboard the Boyd in Utu, Maori revenge. This ruined European-Maori relations for roughly 5 years, delaying a lot of would-be colonization and trade.
A POD could be that the captain visits a different harbour in 1807 and resupplies somewhere else. This would prevent the 1809 Massacre in Whangaroa, so to speak, because the Maori would only demand utu for the flogging of George. The English could easily defend against this, and relations with the Maori would not deteriorate. This would mean that many missionary visits wouldn't be delayed until 1814 and other Europeans would be more inclined to get involved (particularly the French).