Hunger Games
The Rue plot in the book was very powerful, and I was disappointed that it was so highly abbreviated in the movie. I understand that a movie can't contain everything in the book and still be a civilized length, and they did a good job of trimming in general, but this one stood out as a misfire.
The book is written in the first person (first-person present tense, mostly, which is unconventional). This means that in the book you only see and know what the narrator knows. In the movie they showed some of what was going on "backstage" and I found those parts to be well-done, laying the groundwork for the political issues to come. They added rather than detracting -- not at all a safe bet when screenwriters decide to innovate.
Because of the POV, in the book the game-makers are largely invisible -- we see their work but don't see them. In the movie I thought the lead game-maker was particularly strong; seeing how what was going on in the arena affected him added a level of story not possible in the book. And oh, his final scene... nice touch.
A nit: I do wonder how Katniss was able to stay at full draw for so long, with a bow strong enough to kill a person, in that scene at the end. Especially given her state at that time. Just sayin'. (Also, what are the aerodynamic properties of silver arrows? The book referred to them as silver too, and it struck me as peculiar there too.)
The trailers I remember were:
- The Avengers: meh
- Spiderman: looked like it could be fun (but can wait for NetFlix)
- (something like) The House at the End of the Street: no (horror's not my thing)
- What to Expect When You're Expecting: looks very cheesy (that would be a no)
- some Twilight movie: no
- Abraham Lincoln, Vampire Hunter: please make it stop!

no subject
I do not tend to form physical images of people when I read. If the author tells me something I absorb it; if the author is silent on someone's appearance I don't tend to fill in my own. (It also took me most of the first chapter to determine that the POV character was female...) So with that caveat, and having read the book before knowing about casting: I had no impression of Cinna (clothing yes, person no), and I knew Rue wasn't white. I wasn't sure (and didn't spend time thinking about) whether she was black, Indian, or of mixed background. And I do not understand what the fuss is about; why exactly does this matter to anybody?
no subject
From a conversation I had years ago in relation to the Dragonlance Saga:
"Why didn't they SAY Theros Ironfeld is African-American?"
"Uh, this is the World of Krynn. No Africa. No America. He is not culturally African-American, he is from Ergoth, and the people there have coal-dark skin. And their own culture. Read here."
"But-but-but!"
Why does this matter in the context of a work of fantasy or speculative fiction? Sadly, because it matters in reality. Why does it matter here? *wry look*
no subject
Well, it shouldn't, and yet (because of how our society is structured) it does.
Here's an interesting quote I found recently:
Source: Is Christian a Religion (http://thesocietypages.org/socimages/2012/04/26/christian-is-not-a-religion/)
For The Hunger Games, when white folks (dominant race) read it, they assumed that the characters were like them. Since the author doesn't hit us over the head with stereotyped ethnicity (in behavior), the one line of description doesn't make as much of an impression as the internal "of course the character is white".
When folks have to face that initial misconception, they can either go, "whoops, missed that bit of text" or become upset because their status as the dominant race is being challenged. Their heroes are no longer people like them!
As I'm not a PoC, I won't presume to speak for why it matters to them. I'll link Rue Won't Be WhiteWashed in the Hunger Games (http://www.racebending.com/v4/blog/rue-wont-be-whitewashed-in-the-hunger-games/), which says (among other things): [for context, the casting requested specifically caucausion actress for Katniss, despite her being described as "olive skinned"]
no subject
(I don't think of Gale as being one of the leads. Now I wonder what the credits said on that subject; I wasn't paying enough attention. I think Cinna, Haymitch, and whats-her-name the official mouthpiece all got more screen time than he did, though in the book he got more.)