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Ninja Assassin (2009) Poster

Trivia

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Korean pop star Rain had no martial-arts experience prior to filming. He trained extensively for six months in martial arts and weapons handling with stunt and action choreographers Chad Stahelski, Peng Zhang, Jon Valera and Jonathan Eusebio as well as weights and cardiovascular workouts with personal trainers; he also went on a diet of chicken breasts and vegetables.
After Raizo (Rain) is first captured and chained to the wall, one of his captors looks at him and says, "He looks like he should be in a boy band." Rain started his career in the boy band Fanclub.
The Wachowski brothers were so impressed by Rain's performance in Speed Racer (2008) that they were inspired to create this project for him.
Producers Andy Wachowski and Lana Wachowski hired J. Michael Straczynski to completely rewrite the script six weeks before filming started, as they weren't satisfied with Matthew Sand's original work. Straczynski finished the rewrite in 53 hours, and was studio-approved and sent to actors the same week.
One hundred pounds of gold is 1458.333 troy oz. The bank transfer corresponding to the assassination of the Russian Prime Minister Zukoff was $1,555,999.90 - which meant the assassination occurred on a day when the $/Gold rate was $1066.97/oz - which was last on 4 Nov 2009.
WILHELM SCREAM: Ninja blasted from roof of the clan training compound by soldier's rocket.
Director James McTeigue cited the crime thrillers Panic in the Streets (1950), The Getaway (1972) and Badlands (1973) and the martial arts features Ninja Scroll (1993) and Samurai Champloo (2004) as influences for the film.
The fight scenes were staged without having to have recourse to wirework or digital finetuning, except for the shadow-blending VFX.
This was originally supposed to be released in 2008.

Spoilers 

The trivia item below may give away important plot points.

The condition that the Tattoo Master and Mika are seen to have (their hearts are placed on the opposite side of their chests) is in fact an actual existing medical condition known as "Dextrocardia situs inversus": the organs of the chest and abdomen are arranged in a perfect mirror image reversal of the normal position. Most people with dextrocardia have no medical symptoms or complications resulting from the condition and it only occurs in less than 1 in 10,000. NBA basketball player Randy Foye and actress Catherine O'Hara are known to have this condition.

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