At first, this piece slightly confused me, as it didn't seem to have any connection from one piece to the next.  However, as I kept reading, the pieces began to fit, and a world was created.  I supposed that would be the point of the 'montage.'  Going into this, I began with revisiting "A Dream Deferred," as I decided it might be helpful, and put together the world based on the ideas found there.  Whether or not that was helpful or created more boundaries remains to be seen.
What does happen to a dream deferred?  I suppose it must be all of the things that are happening within this text.  What struck me the most was "Children's Rhymes" (223).  The speaker of the poem is important, and perhaps says a lot about what is going on in this world, but I actually focused more on the children and their chants.  What used to be innocent chants became chants that were focused on political events, civil/human rights.  It is always interesting to note when children come in contact with adult issues, because that means the world itself is having issues with whatever is happening.  In this case, "We knows everybody ain't free!," or, they know that there is a difference in how people of different races are treated.  Of course, this isn't news to anyone when it comes to racial intolerance that children were affected, but it is important to note because most often children are protected from such things.  The fact that they were unable to be sheltered shows that the world was fatally flawed, not just flawed in a way that was workable or livable. 
The montage continues on with many pieces including bits and pieces about the world.  One learns that a man was sent to jail for simply asking his (white) landlord to fix his place.  Then, even beyond just racial tensions, the piece "Café: 3 A.M." talks of detectives discriminating against gay men, and of the police lady (or, simply a woman not in a traditional woman's job) as a lesbian.  It is showing the world is not just discriminatory against one group of people, but all people who do not fit exactly what the society is looking for.
To that extent:
Why is it so effective to use different viewpoints to show how this world truly is rather than one person's account?  Would one person's account be just as effective?  Which pieces (if any), if they were removed, would have changed the whole world for you?  In other words, were there certain pieces that changed your whole idea of what this world looked like?  Why did they do so?  How did these pieces fit into the world that you already had formed in your head of the time period?  Did they change anything?