Unmarked spoilers below!
- The kunekune is scary enough in the story it originated from, but Otherside Picnic's take on it goes a step further: staring at the kunekune causes a strange fungus-like substance to grow out of the viewer's face as they "recognize" the kunekune. Sorawo and Toriko actually come across the body of someone who tried this alone... he ended up trying to gouge his eyes out.
- The way Sorawo babbles gibberish (actually jumbled text from the original kunekune story) when trying to "recognize" the kunekune is scary. The manga's take on it is particularly effective. The mysterious "fungus" starts growing from her face too, and later Sorawo thinks about how she would have shared the fate of the man if Toriko hadn't been there with her.
- The way Abarato simply... vanishes during the encounter with Hasshaku-sama. In the anime, he actually seems to realize what's going on and turns to run before simply disappearing.
- The Station February arc has a lot of creepy stuff but maybe the creepiest image is the "walking gallows": a cargo-carrier robot that got warped by the Otherside into a strange, chirping monster that now attacks the soldiers that used to use it... while the bodies of their comrades still hang from under it.
- Sorawo and Toriko actually manage to call Kozakura from the Otherside... for a while. At first, they're able to hold a conversation just fine, but Kozakura suddenly starts muttering about a train arriving soon before trailing off into pure gibberish before cutting out. That's not the end of it, though— when Sorawo and Toriko manage to check up on Kozakura, she turns out to be fine and accuses the two of them of "playing strange pranks." It turns out she recorded the call from her end... and all her recording picked up was an incomprehensible conversation in Sorawo and Toriko's voices.
- The light novel even offers the terrifying possibility that it wasn't that the conversation was altered by the Otherside, but that Toriko and Sorawo were legitimately speaking in mad gibberish without being aware of it.
- The manga has Sorawo bring up a piece of fridge horror: If Kozakura's recording of Sorawo and Toriko's half of the discussion had the two girls speaking gibberish, then what would the result have been if they had recorded Kozakura? Would she also have been talking gibberish? If so then it's possible that the Otherside was able to twist Kozakura's mind just by her talking over a phone with someone located within it.
- The "glitches". One bad step could fry you to a crisp, mutate your body, or drive you utterly mad.
- What's worse than the premise of a couple of girls exploring, observing and trying to figure out an Eldritch Location? How about the implications that the Eldritch Location is doing something similar to them?
- At the end of Volume 2, Sorawo's attempts to read Satsuki's research notes out loud results in an entire page filled with kanji characters arranged in an unusual pattern. The characters don't really make any sense if one tries to read them but, somewhat ominously, at the very center of it all is the character for "person." And that's before Satsuki even shows up...
- If you stare at the pattern long enough, you'll see the shape of an eye.
- Ninja Cats sound like something that should be cute and adorable, but they actually come very close to killing Toriko and Sorawo, and probably would have successfully killed Akari ages ago if not for her karate skills. Toriko, whom we know for a fact is a decent marksman, can't even hit one while shooting, and it's definitely not from a lack of trying.
- When Natsumi doesn't have the teeth that she received, Sannuki extracts them forcefully from Natsumi and Akari.
- Under the influence of Sorawo's Magic Eye, Akari gives a Slasher Smile as she beats an apparition to death.
- Natsumi says she was always worried that Satsuki was going to take Akari away. Given how she took Toriko to the Otherside, it's not an irrational fear.
- Toriko was attacked by a trap that Satsuki left for her. Was Satsuki trying to bring a person she felt close to into the world she now occupied, or was she trying to test the effects on a human subject, and knew Toriko would stumble upon it eventually?
- The image from Episode 10 of Satsuki standing alone in what is essentially Hell.
- Sorawo is kidnapped by a cult lead by Runa Urumi, and one of her followers comes this close to shooting her in the head out of jealousy.
- Satsuki Uruma, or something bearing her image, comes very close to killing Toriko, does manage to kill Runa Urumi's mother in a graphic and painful way and wrenches Runa's jaw out of place. Toriko later says that "Satsuki's" hands were ice cold.
- The Kudan, something that predates the net lore that Sorawo has been researching, a being with a calf's body and a human face. And in their first encounter, it's the face of her late father, and it speaks in the voice of her late grandmother, telling Sorawo that she's a cursed woman.
- Their next encounter with a Kudan, in Otherside, now has it bearing Sorawo's face, and she describes it talking as "I said" and when Toriko shoots it, she describes it as herself being shot.
- The "Red Person" returns, and tries to get her to say that she doesn't need Toriko, the same way she'd said she didn't need her father, grandmother, or the rest of the cult they followed. When Sorawo insists that she needs Toriko, the "Red Person" nearly convinces her to immolate herself with kerosene, and only timely intervention by Toriko wielding an axe saves her.
- The mirror cubes reflect everything around them, except people. Suitably eerie. And made even worse when it actually does start reflecting one person in particular, Satsuki Uruma.
- T-san, an interface from Otherside, has the ability to sever people's connection to the Otherside. He leaves Sorawo with a case of Laser-Guided Amnesia, as well as deactivating her Magic Eye and leaving her blind in that eye.
