1. The Army of Darkness influence is showing here. Except Army of Darkness was enjoyable.
2. Gonterman's work usually requires some suspension of disbelief in general, but in the top panel it sort of overflows. You may want to keep a picture of an actual hummer (the automobile, you pervert) on hand to look at when you would normally be looking at the one Davey drew.
3. Top panel, still: Towards the bottom we have, spelling errors not included, "Sakurah playing 'Taps' or an equivalent thereof" on a trumpet, or an equivalent thereof.
4. Bottom right panel: If this were the US, there would be dollar signs in his eyes. Since this is Japan, though, they are yen. Yeah, I laughed too.