Maybe that was a frequent joke in the japanese forums and Ryuukishi made fun of it, kinda like "Ina Bauer" in EP5.
Shannon's fake breast and Shkanon were speculated very earlier even in this forum, so there's nothing really strange.
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The "culprit is Yasu" thing is a Japanese NDS murder mystery joke, and the rest are probably purely coincidental, or based on fan theories.
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It's actually a lot older than that, it comes from the NES era.