Factual error: The grenade that the SWAT team fires in the hotel is supposedly a smoke bomb, but it is both marked ILUM and has a white body, meaning that it is an illumination grenade.
Leon (1994)
1 factual error - chronological order
Directed by: Luc Besson
Starring: Gary Oldman, Jean Reno, Natalie Portman, Danny Aiello
Continuity mistake: In the very first scene where Old Tony is debriefing Leon, we see Leon pick up his glass of milk and drink the entire glass. However, if you look at the reflection of Leon's glasses as he takes the glass away from his mouth, you can see that the milk is not finished. (00:02:30)
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.
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Answer: According to IMDb.com the title was only changed in the United States and the reason why was maybe audiences would find the title, "The Professional" more appealing than "Leon."
Tobin OReilly