Visible crew/equipment: When the SWAT team fires the grenade into the apartment at the end, the guide wire along which it is traveling is very obvious. It's actually easier to see in normal speed. (01:29:25)
Visible crew/equipment: Near the end of the film Leon tells Mathilda to grab the axe. As she opens the glass door to get it you can see the camera and its operator filming reflected in it.
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