Great question — answering as the UphillTech team:
I've watched the original (now pulled) and the edited version (currently on CrunchyRoll). The only change I noticed was with regards to the dialogue in the play which Shizuka attends, about 11 minutes into the episode. The original dialogue was clearly taken from Samuel Beckett's famous play Waiting for Godot . This play is still copyrighted. To make things worse, as is described in the Wikipedia article linked, Beckett was strongly opposed to having female actors cast in the play, which the episode has. While the amount of the original it used was quite small (there's only about 15 seconds of dialogue), Japanese copyright law has no fair use policy , and so this could still be an issue....
Full answer by Logan M: https://anime.stackexchange.com/a/17054 (CC BY-SA 3.0).
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