Bullitt (1968)

Plot hole: The movie is based on one huge plot hole: if it wasn't for the "professional" hitman's sloppy work, Bullitt and his team wouldn't have been needed for much. The hitman enters the hotel room, wounds the policeman, then shoots the target with one shotgun blast to his upper left shoulder area. Any hitman worth his fee knows that this is not likely to be an immediately fatal wound. The hitman had a pump shotgun and should have finished the job right then and there. Surely he had more than two shells. Instead, he sees the target is slumped unconscious, then leaves the hotel room without checking to see that his victim really is dead. Nothing seems to be immediately threatening the hit team, though. The hitman spends the rest of his life trying to finish his job and pays the ultimate price for being lazy.

Bullitt: Who else knew where he was?
Walter Chalmers: What?
Bullitt: Who else knew where he was?
Walter Chalmers: What are you implying?
Bullitt: Well, they knew where to look for him, and they used your name to get in.
Walter Chalmers: Are you suggesting I disclosed his whereabouts?
Bullitt: Well, somebody did. And it didn't come from us.

Trivia: Although we never know the names of the hitmen, Bill Hickman (who drove the Charger) is listed as 'Bill' in the end credits. He was so well respected for his stunt work - and had remained largely anonymous in previous films - he was given an identity for Bullitt.

Question: What happens at the end of this film? Was the man who was shot the real man, and who was that guy who McQueen shot at the end?