Pluto: This where Misato changes her preferred beer brand from Yebisu to Boa. Yebisu is an actual beer whereas I've never seen Boa.
UrsusArctos: Apparently someone on the ancient JAE FAQ (Olivier Hague?) identified "Boa" and "Kuroshio Bussan" as references to the 1969 anime movie "Sora Tobu Yurei Sen", where Boa Juice is a highly addictive and poisonous beverage. Looking at the Anime News Network page for the show, it all checks out. As an aside, one of the key animators on that movie was a young Hayao Miyazaki, which probably explains why that particular reference was chosen!