Continuity mistake: Near the end of the movie, the Jackal tries to kill the first lady in Washington. This is where the hospital opening takes place. When he flees into the subway station, the name it has is indeed of a station in Washington (Capitol Heights), the subway-cars however are from the Montreal subway system (which ride around on rubber tyres).
Declan Mulqueen: This man is no clown. He knows all your moves, back to front. Right now you've got a name; that's all you've got. The Jackal has got a target: you. He's got a timetable. And as to making mistakes, he's spent twenty years in a trade that doesn't forgive error. And he's prevailed. You think he's the one up against it? It's the other way around.