Haha this is awesome, it's awesome to see what people have to say or when they come with their own conclusions, it makes me feel like there's someone paying attention..! Hehe.
Now, personally I can't confirm much of this cause it'd be considered spoilers coming from me, but I'll comment what I can!
1) Good eye there, took long but there's indeed more monsters out there.
2) Perhaps clowns are popular in town~?
3) Well, one clown tried to lure her into a trap, too, can't say there if it's a strict correlation : P but good analysis.
4) Hahaha fanservice most likely (or maybe he knows her sizes too well (??) jk jk)
5) I know many people would think of a possible rape scenario, but, like you said, it was just a "Ahhh I know what you guys are gonna think about this!" moment, so, exactly, there wasn't any clothing pulling, and Aria doesn't react according to a rape attempt anyway, like you pointed out, the tentacles are in her ears.
About the next part, hehe, can't say much, but there's some good reasoning there~