me too, i want to see how Hitsugaya becomes a captain...
actually this kind of ep is good for once a while. it is interesting to see the past, how they all became current captains and leutenants.
I remember one ep showed a group of leutenants sitting with each other including Hinamori, 69 guy, and Kira. So They are good friends.

And I don't know why Hinamori knock down the guy in the cell at the end of the ep. Is she trying to escape? Hope the answer will be on the next ep

Yeah, how often will they change the opening and closing theme?