http://www18.atwiki.jp/sakuga/pages/1524.html
Random scenes
Okiura drew the photos and Momo crying when looking at them
Honda the broom fight
Nishio the dancing
Ohira the raindrops falling
Inoue the scene with kids jumping from the bridge in the beginning as well as the end (bahi's gif linked earlier)
Boars
Boar chasing first half Suetomi
Boar casing second half Inoue
Boars slowing down Kise
The fart Yoshinari
The Climax
Monsters gather Ohira (duh)
Bike scene Aoyama
Monsters gather at the bridge Ohira layout Honda KA
Monsters start moving Honda
Bike jump Mukouda
There are more annotations but that's it for now