Without in any way intending to make an overall definitive statement on the film's accuracy to pre-colonial Polynesia, I'll say that it rang pretty true to the research I did when writing Voyage of the Basilisk. And, in a similar vein to what I was aiming for with that book, I take it as a plausible depiction of Polynesia rather than any specific location therein: that is, it feels to me like it fits believably within that culture sphere, like these could maybe be a handful of islands somewhere in the Pacific that just don't happen to be the ones we know.

All of the above accompanied by a heaping spoonful of "I did this research several years ago and certainly didn't become an expert" salt. Maybe I could just say, it was accurate enough to make me pleased that I saw things I recognized from my reading being represented on the screen.