
Question: In the scene where Cheyenne visits Jill at the McBain's residence for the first time, he asks her whether she knows something about a man with a harmonica, although the three of them (Cheyenne, Harmonica and Jill) met earlier in the movie when Cheyenne tells Harmonica to "watch those false notes." Why doesn't Cheyenne just ask her for the man whom she probably still remembers from this event?
Answer: He meant what does she know about him personally. What's his real name, where does he come from and why is he so interested in everything.
Then he should have asked "do you know something about THE man with THE harmonica?" instead of "do you know something about A man going around playing A harmonica?" (time stamp 01:05:25 for the restored version) or am I missing something? He already knows that she has seen him because he was there so he could just ask "do you know something about the guy with the harmonica we met at the bar earlier?" I just don't understand why Cheyenne is using an indefinite article because he and Jill both know who he is referring to.

Question: What character did the actor John Aprea play in the movie? The credits at the end lists him as 'The Killer', but who did he kill? He wasn't one of the two hit men at the hotel.
Answer: Notice: Aprea is credited as "Killer", not "The Killer." I think this confuses reviewers, as they assume he must be one of the hit men. However, the hit men are credited as "Phil" (Bill Hickman) and "Mike" (Paul Genge). Genge is much older than Aprea and Aprea does not look like the grey-haired hit man, as another contributor has pointed out already. There is no other killer in the plot. Perhaps Aprea's scenes were cut.
Answer: The doctor that alerts Bullitt that the grey-haired hitman is in the hospital looks like Aprea. He calls himself Dr. Kenner, and that character is uncredited. Maybe "Killer" was supposed to be "Kenner" in the credits?
Answer: Aprea portrays the Organization hood who shoots wildly at Johnny Ross as Ross' car careens out of the parking lot into and down the alley during his getaway in Chicago.
Answer: In a Bullitt movie clip on the Turner Classic Movies (TCM) website, it identifies John Aprea as the killer who goes to the hospital to murder the witness. Bullitt chases him to the basement toward the end of the film.
The killer that Bullitt chases is Paul gange (listed in the credits in the role of "Mike") despite the TCM website. Aprea is listed in the movie's credits as the killer, but also lists gange as Mike. Look the name up on IMDB and you can see from his photo that he is the guy Bullitt chases. Why John Aprea - at least 20 years younger than the killer in the movie - is credited as the killer, I have no idea. And I have no idea where in the movie Aprea really appeara.

Question: At the end he sees the Statue of Liberty on the beach. How did the statue get there from Ellis Island?
Answer: He's in the same location as Ellis Island. Thousands of years have resulted in significant changes geographically.
Answer: The statue was destroyed during the nuclear war at some point in the past. The remnant of it had washed ashore to where Taylor finds it.

Question: Mary's attire looks more like 1960s than 1940s. Any info on this?
Chosen answer: This is not unusual in older films. Earlier costume designers were less attentive to historical accuracy and freely incorporated current fashion trends into period movies. It was just an accepted practice and movie audiences back then were often less discerning and/or unaware of inaccuracies. Today's costumers have greater access to historical information, do more research, and strive for authenticity.
Answer: The movie was filmed at multiple locations in Spain and Italy, and also in Utah. Chances are they filmed out of sequence and made minor changes to the script later in the movie. There are many things left unclear in the movie, for example the same scene at the cantina/store, just after Cheyenne's crew shows up, he refers to Harmonica by his name when no-one said his name up until that point.