: When other Captains arrive to help, they find Kensei and Mashiro transformed into mindless, white-masked monsters—the first successful "Hollowfications" orchestrated by Aizen.
: Kisuke Urahara, then the Captain of Squad 12, is consumed by regret after sending his own lieutenant, Hiyori Sarugaki, to investigate the site.
: This period of the anime marked a significant technical shift; shortly before this arc, the series transitioned from the traditional 4:3 aspect ratio to 16:9 widescreen .
: Behind-the-scenes accounts from the English dubbing sessions reveal that the emotional weight and constant screaming required for these transformation scenes were physically taxing for the actors; some reportedly nearly "blacked out" during high-intensity sessions.