American Football Clinic Trivia Q & A of the episode:
Q: What does the offensive line do?
A: They become a protective wall for the quarterback and running back on offense. Swat down your enemies with your power! YA-HA!
Deimon High's policy is there are no extracurricular activities, like sports or clubs for 3rd year students. This explains Hiruma and Kurita's drive to win the Christmas Bowl this year.
At the start of the episode, Juumonji witnesses Sena running away from Ceroberos, and deduces that Sena is Eyeshield 21
Doburoku-sensei mentions Musashi, a friend of Kurita and Hiruma's. He was the place-kicker for the team, til he left for personal reasons.
The rest of the Devil Bats team members (except Mamori) learn that Sena is Eyeshield 21.