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The Danza: Reggae singer Willi One Blood plays one of Stansfield's goons; another character calls him "Willi", and Stansfield calls him "Blood".
Dawson Casting: Luc Besson averted this with Natalie Portman (who was eleven years old during filming); he resisted early attempts to cast older actresses despite knowing such a call would have made things easier for him.
Executive Veto: The American theatrical version of the film cut certain shocking or morally gray scenes of the film, including the most Lolicon-ish aspects of the Léon/Mathilda relationship and scenes of Mathilda accompanying Léon on his assassinations. These cuts change the film's characterizations drastically: in the edited version, Mathilda remains far more pure and ends the film without blood on her hands, allowing her to return to a reasonably normal life, but in the unedited version, she's helped kill over a dozen people (which doesn't fit with her hesitation to kill Stansfield nor her apparent rehabilitation at the end - though some argue that it does fit the end, as she is just an amoral manipulator).