Titanic (1997)
In Titanic, Jack tells Rose that he’s been to Lake Wissota in Wisconsin. However, this trip would never have been possible because Lake Wissota was formed in 1917 during the construction of the nearest power plant on the Chippewa River. Titanic sank in 1912 — 5 years before Lake Wissota appeared.
As to Hagrid's parents, love will find a way, especially if one of them is a wizard.
BTW, I had a Korean friend who was incensed beyond measure that all the North Korean characters spoke with _South_ Korean accents in 'Die Another Day' — and even more by the villain's dad, who had a Cantonese accent.