I enjoyed the episode. My biggest problem is that Shonda seems to forget the personalities she developed for people. Arizona was a sweet, high-ponytail, heelys girl. I know she had the leg blah blah blah but her inherent personality is different. I used to love Arizona because she was the forever optimist. Now she's just grouchy and whiney. That change happened before the plane crash, so it's like Shonda forgets who people are and just writes to fit the story. But that doesn't work (a friend and I always talk about how Burke said his mother owned a restaurant and then we MET her and she would NEVER own a restaurant - her personality was completely opposite of how Burke originally described her). It's things like that that piss me off.
Surprising about the miscarriage - took me a minute to figure out the timing of things, but I guess it was when Mer was still pregnant.
I liked the episode and while they didn't touch on the other stories going on (Bailey, Mer/Cristina), it was so devoted to Callie that I'm not sure it mattered. They didn't skip ahead in time, so next week should slide right back in.