Those were my two main spots as well, and I cried more when Katniss volunteered the second time than the first time!
I agree that the sense of time in the Games didn't feel authentic. When they're shooting the fireballs at her, the clock in the Command Center says that 3 days have passed. It didn't feel like three days at all. I didn't think to see what the center says at the end, however, for how much time was supposed to have passed.
I thought the actress who played Clove was the best overall actor of the Career Tributes, but I will say that it was really noticeable how much younger she was than the other three. I always pictured Clove as being larger and more ferocious in appearance. Isabelle Furhman can't be taller than 5'2" or so and was really tiny. I think the actress was 14 when she was cast.