[Claies]

Spoiler for Episode 4:

Konata's second lateness explanation refers to a scene in the first episode of Kanon (2006 remake), where Ayu crashes into Yuuichi with a bag of taiyaki that she accidentally "stole" in a panic.

Miyuki's gift package may be a reference to the American jewelry company Tiffany & Co.

Kagami's birthday gift is the Brigade Chief armband, worn by Suzumiya Haruhi from Suzumiya Haruhi no Yuutsu, a Kyoto Animation production.

Tsukasa's birthday gift is the school uniform from anime To Heart. Konata notes that it is very similar to their school's uniform.

Konata imitates Crayon Shin-Chan while commenting Kagami while they ate the birthday cake,

While wondering whether Konata would do better in school with a study-related game, Kagami references Moe Drill, a spinoff quiz game from Lucky Star the manga for the Nintendo DS.

An action figure of Akuma (or is it from DBZ?) sits on Konata's desk while she studied.

Konata reads __________ while taking a break. (Please fill this in)

Konata criticizes the typically long scenes in Suzumiya Haruhi no Yuutsu involving character Nagato Yuki, along with episode director Yutaka Yamamoto. She then reads a thread on 2channel, Japan's largest internet forum community.

Konata reads another issue of the Comptiq magazine, noting that the summer Comp Festival is about to begin.

[[[ What light novel was Kagami reading? ]]]

Kagami sings "Sailor Suit and Machine Gun" in the end credits.