Trailer was cool... definitely have to check out.
I have travelled extensively through this part of Asia( including Viet Nam) and I noticed a couple of inconsistencies, though.
The floating market scene in the trailer is actually located in Thailand and the temple ruin scene is actually located in Cambodia (I have visited both locations).
I am wondering if any of this movie is actually filmed in Viet Nam (did see a famous Vietnamese actress playing the role of a Hanoi Hannah type character).