- Japan also has its own forms of fighting sports, known as martial arts. Other than sumo wrestling, it also has aikido, karate, and judo.
- There is an actual city in Japan known as "Obama" (小浜), located north of Kyoto in the west-central part of Honshu island. Its name means "little beach".
- "IKZO" (mentioned in Billy Herrington's Speech) is a nickname for the Japanese singer-songwriter, Ikuzou Yoshi (吉幾三). One of his songs, "I'll Go To Tokyo" (俺ら東京さ行ぐだ, Ora Toukyou sa Igu da), became a popular remixed music video meme in Nico Nico Douga.
- Ikuzou Yoshi was born at Goshogawara-shi, Aomori Prefecture (五所川原市, 青森県), located at northern Honshu near the island of Hokkaido. It is not a small village, but a city.
- "IKZO" also sounds similar to "Iku zo" (行くぞ), which means "Let's go".