A previous reviewer spent time detailing the scenes in the movie, most in regard to water related scenes, that were inaccurate in his/her view. Yet the inaccuracies were the entire point. I think this is summed up quite magnificently at the end of this gem of a movie.
In my opinion, any movie made in the last 10 years that has you reviewing it in your mind for a period of time after viewing it, has merit. In this age of predictable, cookie cutter movies and prequels, sequels etc., an original screenplay and story with thought behind it is a unicorn. Loved it.