Other otaku-ish references that I noted:
1. Initial D (obviously www)
2. Shooting a watermelon (Fullmeta Fumoffu)
3. Konata's reference to
Mister Ajikko when saying "it's not that good as if to run in the beach wearing nothing but a
fundoshi"
4. an event flag, reached a pivotal save point to obtain 100% CG (any generic galge or eroge) www
5. Singing "Danzen Futari wa Precure" at the horror story wwww
Japanese centric references:
1. Tsukasa's oyaji-gag "Yokkoi Shouichi" wwwww
2. Konata's Timotei impersonation
3. Konata's "U-n Mandom" refers to a Japanese commercial from 1970 in which a cosmetic company called Mandom hired an American actor
Charles Bronson for that one single line and became an instantaneous hit
4. Sukekiyo, Inugami = Inugamike no Ichizoku, a mystery literary novel by
Yokomizo Seishi which was made into several movies and TV dramas
5. Tsukasa hold the shell in her ear and her remarks "Tsukasa desu" =
Hiroshi desu wwww
6. TV: "Jissai kiite mita" = Sounds a lot like the TV show
Hey! Spring of Trivia
7. Shiraishi Minoru at the end of LC: "Sono toki tokuhai-in ga mita monowa!!" (from the mid to late 1990s show Toukou! Tokuhou Oukoku)