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For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for Big Fish can be found at http://www.imdb.com/title/tt0319061/parentalguide.
Yes. The novel Big Fish: A Novel of Mythic Proportions by American author Daniel Wallace. It was adapted for the screen by American screenwriter and film director, John August.
No particular war was given in the movie. In fact, the diverse languages being spoken (Cantonese, Mandarin, and Filipino) was done on purpose to obfuscate a reference to any country/war in which Ed might have been. Ed is old enough to be a veteran of WWII, but he is fighting the Chinese, who would have been allied with the US at the time. This is simply to let the audience know that the war is not WWII nor any specific war but is symbolic of all wars. Burton talks about this in the commentary. He claims, "This movie is not meant to be historically accurate".
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