Title
"Kiri's Search for Meaning" is a pun on a book by Austrian psychologist Viktor Frankl called "Man's Search for Meaning". The Japanese title of this chapter is "Kiri at Night" (夜の霧 yoru no kiri), which is a pun on the Japanese title of Frankl's book, which is "Fog and Night" ( 夜と霧 yoru to kiri)
Page 2
Poster (Panel 2)
The poster says "If you have worries - Chie", referring to Chie-sensei and her counseling job.
Page 3
Hikikomori Union
全日本座敷童連盟 - zen-nihon zashiki-warashi renmei
Page 7
Pictures (Panel 1)
The Gyoza Statue is located in Utsunomiya, Tochigi.
"Dash Village" is the setting of a corner on the Japanese variety show called "The Tetsuwan Dash".
Page 11
Kafuka's bedtime story
Kumetan-jp thinks it may be a reference to this.
Ending Text
It's neither deep, nor uncontrollable. Hito-san's "Small Talk" is even stronger than chemicals, and has no side effects at all.