The examples given were "trivial" enough to be closed.
I tried to edit this questionthis question by asking for the significance of the song. The answer was a very good one, because it not only identified the song, but gave the underlying context, about the courtship of a peddler and a girl. I added a comment that perhaps the metaphor could be extended further, to the "courtship" of the Russian and American presidents.
Songs are (usually) put into movies for a reason, and if the question asks for the context/meaning of the song (within the movie) as opposed to "identify" this song, it might be a very good question. Other, non-trivial questions that might "add to the understanding of the title" might be, who played in/produced movie X, followed by "What other movies (or types of movies) did this person play in/produce?"