High School of the Dead (TV)

A few of those credited as "Them" are staff members on the anime, including animation director/character designer Masayoshi Tanaka, ED singer Maon Kurosaki, and the source manga's artist, Shoji Sato.

There is a OVA. 

Is banned in China.

in episode 1 at the observatory when hasashi died and when the sun started to shine the song that being played is the same theme song of the 28 Weeks Later Theme/Don Abandons Alice by john murphy

In episode 1, in the beginning of the episode, the kids are standing behind what seems to be the train Makoto runs into in “The Girl Who Leapt Through Time” movie.

In episode 2, the character Kouta Hirano is introduced. He bears a striking resemblance to the real Kouta Hirano who created the Hellsing anime

In episode 2, Shizuka compares the whole zombie epidemic to a George Ramero movie she once watched. She is of course referring to the “Living Dead” films made from 1968-2009.

In episode 2, the Mel Gibson movie Saya was referring to after observing the nail gun is “Lethal Weapon 2”.

In episode 3, the name of the convenience store is "Sevenson", a cross between 7 Eleven and Lawson. Furthermore, the cashier resembles Shaun of Shaun of the Dead.

In episode 4 the name of the self-service gas station is "Shaun" the same name as the protagonist in the "Shaun of the dead" movie.

In episode 4, the self-service gas station "Shaun" is also a parody on "Shell" gas stations.

In episode 5 around 6:23 you can see a poster that resembles Naruto, and other posters too.

In Episode 5, Hirano makes a point of exclaiming his double tap when killing a zombie, possibly a reference to to the movie "Zombieland".

In episode 5, Bae Yong-joon, a Korean drama star, was shown as a zombie.

In Episode 6, Kouta Hirano says "I like turtles" after seeing Saeko virtually naked. This is reference to a highly viewed video and meme where a kid who is dressed as a Zombie says "I like turtles."

In episode 6, the title “In the DEAD of the night”, is a reference to the film “In the Heat of the Night”.

In episode 6, the scene where the little girl bit her mother's neck is similar to a scene in the movie “Quarantine”.

In episode 8, Hirano references "The Rat Patrol" at about 8:30 in.

In episode 8, at the beginning, one of "them" is seen that resembles Condoleezza Rice, the former Secretary of State of the United States.

In episode 11, the episode's title, “DEAD storm rising”, is a reference to the novel “Red Storm Rising”.