These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ebichu's first transformation into Ebichuman — the visual effects lead us to expect a Transformation Sequence, but she simply declares "Ebichu, transform!" and then goes over to the dresser to put her costume on.
The "bad smell" incident. Trying to pinpoint the source of a horrible smell in O.L.'s apartment, Ebichu blurts out a number of embarrassing revelations that get Kaishonachi beaten up (along with her, as usual). The punchline, not to give away too much, is that the bad smell is most definitely not Kaishonachi's fault.
EarWorm: The closing theme from Ai no Awa Awa Hour, the anthology series of which Ebichu is a part, tends to get stuck in some viewers' heads; it doesn't help that the lyrics are Word Salad Lyrics even by Japanese standards.
On a lesser level, the newlyweds next door. They dress in matching outfits, are constantly grinning and sharing any number of stupid lovey-dovey injokes, and (if the sounds coming through the wall are any indication) have a REALLY healthy sex life. When it emerges that they're also devoutly religious, Ebichu and OL start to wonder if they're going to hell for eavesdropping on them.