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According to Nicolas Winding Refn, this movie is a thriller produced as a western, all in the Far East, and with a modern cowboy hero.
Chang's (Vithaya Pansringarm's) outfit in this movie is what retired cops in Thailand wear.
Writer and director Nicolas Winding Refn directed Vithaya Pansringarm by whispering into his ear: "You are God".
In his commentary, writer and director Nicolas Winding Refn states that Bangkok is a radically different city depending on the time of day. If it is daytime, it is, in his words, like Disneyland. By night, however, things are far more sinister.
According to a Nicolas Winding Refn Q&A at Bam, the infamous insult "cum dumpster" was added into the movie after Refn (late one night) asked Ryan Gosling to come up with a list of the most vile words you could say to a woman. That word was at the top of his list.