In Chinpokomon, the Japanese, under Emperor Hirohito, wanted to avenge their defeat in World War II by perpetrating another Pearl Harbor attack (through Chinpokomon toys, no less), but here, under Emperor Akihito, they are grateful for learning that a whale and a dolphin were responsible for the bombing on Hiroshima. Stan was about to tell the truth, but Cartman reminded him that the Japanese were out to annihilate anyone responsible for that bombing.
"It's, it's not like we can change the way an entire country thinks." - Stan manages to do just that when he convinces the Japanese that the ones responsible for the atomic blast at Hiroshima were a chicken and a cow, not a dolphin and a whale. When the Japanese start killing chickens and cows, they become just like us, as we consume LOTS of chickens and cows.
Songs featured in this episode: Lady Gaga - Poker Face and Smashing Pumpkins - Bullet with Butterfly Wings (a song in which neither bullers nor butterfly wings are mentioned in the lyrics).
Stan's hair is visible under the black cap he wears as the 's new captain, even though that cap has the same dimensions as his usual blue cap with red trim and puff ball.
the footage of the atomic bomb going off was not the one from Hiroshima. The Hiroshima footage can be found on YouTube: