Elsa and Anna’s parents were going to Rapunzel’s return celebration 3 years ago when their ship sank, which is why you see Rapunzel and Flynn attending Elsa’s coronation 3 years later.
Kingdom of Corona is in Germany.
Kingdom of Arendelle is in Norway.
The Little Mermaid was near Denmark.
What if that sunken ship in The Little Mermaid is the King and Queen’s of Arendelle’s??