Trivia: There are many similarities between A Clockwork Orange and the film Leon. Both main characters 'Alex' and 'Leon' are seen drinking milk many times in the films. Stansfeild (Leon) and Alex (ACO) both listen to Beethoven to stimulate their violence and the song 'Singing in the Rain' is featured in both films.
Trivia: During the film, the character Mathilda was depicted as a smoker even before she met Léon and can be seen holding a cigarette early on. Despite assurances from Director Luc Besson, Natalie Portman's parents were so opposed to the idea that they wouldn't allow their daughter to be seen with even candy cigarettes in her mouth, so she only "holds" it, which actually added subtext.