@Black:
I'm not sure if I've mentioned this before but the ED slowly fading in during the last few seconds of the episode is always my favourite thing an anime can do. This episode ending with ending with a silent explosion and Hyori Ittai beginning to play was phenomenal.
Also for the last couple of months in the preview for the next episode the conversations Gon and Killua have been having are so sweet and sappy, I love it.
There's also a huge, growing piano rendition of the ending theme that starts playing when Killua is having his inner monologue after first seeing Gon-san and then continues all the way to the end of the episode. I agree about how the music is being pulled off this season, especially towards the end of each installment. It's had a really nice effect that sort of wraps each episode up very nicely. Pitou's final moments were pretty awesome, especially the accompanying music.
This episode in particular was really good. I was super impressed with the transformation sequence, I loved how dramatic it was when Gon's eyes lit up.