To sum up this episode, for Ryuuji's relationships with the three girls, it's really +1 with Ami, -2 with Taiga and -3 with Minorin in my opinion.
Ami: Her consoling of Ryuuji was nicely done. It further emphasize their "friendship" as one of equals where they will support each other when needed, and walking parellel with each other.
Taiga: It seemed to me that Ryuuji's really imposing his "lack of a father" wishes upon Taiga, so much so that he's really clouded right now, with his straight retort back towards Minorin and his mother, the lack of understanding of Taiga's father as a person and the truth behind them and the seemingly lack of concern on whether Taiga is really moving away to live with her father. Just a simple "It's fine if she's okay with it." is not good enough, showing his lack of desire to understand Taiga more and to be really with concerned with her and again illustrating his subconscious of not having his father with him.
Minorin: The argument was surprising to say the least. I'm really curious to what her background entails, the things that she faced that now has her in this facade she created.
In essence, it seems to me that Ryuuji doesn't really seem interested in knowing more about the three gals, especially Taiga and Minorin. He takes great care of Taiga, although at times he doesn't seem to understand Taiga's concerns and assuming things on the whole. The swimming pool scene was one example.
With Minorin, it's the same thing. Even though it's Minorin who clamps up, but with Ryuuji liking her even though he doesn't really know much about her cept for her "genki" personality, Ryuuji/Minorin is not going to have a development till Ryuuji knows the ins and outs of Minorin.
Back to the episode as a whole, the play was hilarious. Haruta/Kitamura/the rest did very well in improvising with Yuri-sensei going berserk and all. Ami's twin tails was pretty well-done, though my moe meter didn't went up very high.
In the end of this three-episode arc, perhaps Ryuuji finally understood Taiga's father's intentions, and realises his mistakes and follies. That's my take.