I thought that the Black/Red Getsu Gatenshou was the signature for Hichigo and not for Zangetsu. That was Black/Blue. That's the only thing that I saw that was wrong in this ep.
The rest was just awesome. I was kind of hoping that Ichigo himself would be laughing due to Hichigo's influence but sadly that didn't happen.

Oh and Renji used that move on Aizen when he broke his Shikai. That was the first time he used it if I recall it correctly.