Another flashback chapter this week, though this one doesn’t pre-date the serialisation like the earlier ones did.
Dunno if the book Asumi’s reading on page 158 is real - books called こども図かんシリーズ exist, and kids’ books about space certainly exist, but the combination is common enough to be difficult to google. Certainly books like it turn up frequently enough, but nothing identical.
Page 164, oh, it’s Grandpa, here to give Asumi his long straight thing.
Page 158, 帰りたいけど帰れない happens to be the name of a real song, but as it wasn’t released until 2018, it probably isn’t what Fuchuuya is singing in the first panel (quite aside from the fact that this volume was first printed in 2004, it’s still only 2017 in the in-universe timeline at this point).
Page 168, as I mentioned in a note earlier in the volume, the background character names that Suzunari-sensei is calling out here are all stations on the Chuo Line (in this instance, they’re specifically from the Ome branch): Tachikawa, Akishima, Fussa and Hamura. Hence Fuchuuya muttering 何線だそりゃ in the second panel.
Page 184, pineapple, uh… dismemberers exist, but I can’t find one that looks exactly like this one from a casual google.
Page 186, Yaginuma musing about メロス and セリヌンティウス is a reference to the 1940 Japanese short story 走れメロス, which is a reworking of a 1799 German poem Die Bürgschaft, which itself is a retelling of the ancient Greek legend of Damon and Pythias.