Other mistake: When Leon enters the apartment building in the first shots he, needs to go up the stairwell in order to get to his apartment. But in the scene when Mathilda enters the building (after getting groceries while her parents got shot), she's right on the apartment floor without having to use the stairwell in the first place. (00:20:00 - 00:30:00)

Leon (1994)
1 other mistake - 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: In the shot outside of Tony's restaurant, before the scene where we see him celebrating his birthday and being interrupted by Stansfield, you can see someone walking past the restaurant. That person is Luc Besson, the director of the movie.
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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