Kurita's jersey number - 77
Hiruma's jersey number - 1
Sena's jersey number - 21
At one point during the scene where Kurita explains what the Christmas Bowl is to Sena, Kurita has eyeballs, as opposed to just having pupils.
Kurita often yells "Funnuraba" whenever he blocks. This grunt of his has no particular meaning in Japanese.
This episode name is the same as the first chapter of the manga! There are a lot of episodes like that.
The final kanji in Hiruma's name is the kanji for demon... explains a lot doesn't it.... For the record, his first name is Youichi.
Sena refers to Mamori as Mamori-neechan, literally, Big Sister Mamori. Mamori's a year older than Sena is, and given their past history, it explains him calling her this.
If her name was written with the proper kanji, Mamori's name would have the kanji for "protect."
Pay attention to three boys bullying Sena in this and the following episode, they will play an important role later on for the Deimon team.