I think the horizontal rails of the fence shown on pages 1 and 2 should be on its inner side. The way they built it makes the fence easier to climb from outside, especially for humanoids.
There's a mistake on the 10th page: "on the 243th day" instead of "on the 243rd day".
The sound in the lower left corner of page 20 is ズルッ. Also on the same page in the uppermost panel it's not "bang" (which likely would've been バン), but バリ ("rip'n'tear" in this case).
I recognize that "Mega Milk" grin on the 10th page.
In raws the store sign on 13th page reads as "[In]ternet karaoke", not "Damn kids". I presume the "Damn kids" remark should be in the "Do it a little bit quieter, you two" bubble (smaller font). Also on the same page Anjou doesn't repeat: "Ah-...