Amanda, full-stop. Her responses to you if you get her questions wrong start off passive-aggressive, then it turns to frustration. By the third episode, she's gone completely mad. Or maybe she's hungry...
Special note to her face when she's standing outside the door to the house, with her constricted pupils and a wide grin.
The demonic noises that play when the player types in something, Amanda's true form showing up on the TV, Amanda contorting and her eyes turning white as she says "SAY HELLO", the pile of wool next to her at the start (Wooly?) - Episode 3 is just freaky, full stop!
When Amanda has you knock on and open the door in Episode 3, playing with headphones makes it clear that the sound of the door isn't coming from the TV but off to the side, implying it's a door in the real world.
The soundtrack sounds ominous in all the tapes, but especially in Episode 3.
The treasure hunt tape has Amanda pull out three items to use, two of which they used already. The items are a crowbar, a rope forming a noose, and a shovel. None of these are particularly comforting to see, given the implied context, and Amanda even says they used the crowbar to "open a door" and that they "need to dig up the treasure before someone-" only to be cut off by Wooly, who Grew a Spine and urges the player to take the tapes out and burn them. The tape ends with Amanda warping into some horrific shape behind Wooly, who lets out one final distorted bleat as she does who knows what to him.
Even before it turns creepy, the treasure hunt tape just feels off. Wooly is clearly out of it, trailing off as if he's forgetting his lines. Amanda, meanwhile, now has the animation quality of an SFM model getting its mouth flapped up and down. The Stylistic Suck here makes her look downright jarring next to the better-animated Wooly, and it gives off the impression of Glamour Failure.
Update 1.4 allows the player to walk around the room where they view the tapes. The area appears to be a Room Full of Crazy, the walls filled with many red phrases that almost seem like Madness Mantra.
Full Game
Whenever Riley fails to keep Amanda satisfied, there's a bump heard from behind them after the most recent tape ends. Then the trap door to the attic opens and Amanda bursts in, now fully in her Eldritch Abomination form, and lunges at Riley and devours them.
If you listen closely to the noise Demon Amanda emits, it's a combination of demonic roaring and Amanda screaming aggressively at you.
Amanda playing Doctor with Wooly in the alternative "Oh no! Accidents!" tape. As in, she straight up drugs him, it cuts to them in a bloody operating room with Wooly on the table, and Amanda’s all scrubbed up for surgery to “fix Wooly’s head”…
The Petting Zoo episode.
Wooly slowly regressing into a regular sheep is both heartbreaking and terrifying. It starts with him doing one harmless bleat at the start of the episode, then gets worse as Amanda forbids him to talk because it's not something animals do, after which he actually loses the ability to speak and can only make scared bleats. When Amanda proposes (reads: orders) that they visit the sheep enclosure, Wooly looks horrified and tries to get Riley to stop what's going on. When Riley is inevitably forced to do what Amanda wants, the next time we see Wooly is as a fully converted sheep, happily bleating away on a meadow with no memory of who he was or what happened to him.
The Lonely Kitten scenario, no matter how you answer. If you refuse to help the Lonely Kitten, Amanda breaks down literally and metaphorically, repeatedly begging you to help the Lonely Kitten while her surroundings and body distort and twist to an extremely disturbing degree. If you do agree to help the Lonely Kitten, Amanda just stares at you, then starts breaking out into a Slasher Smile.
On a related note, It's not just Amanda looking at you. As the tape comes to an end, the sheep in the pen with Wooly slowly turn and look up towards the screen as well. Neither the Lonely Kitten nor Wooly do this, which implies the three sheep may be more than they appear...
"Some Mommies eat their babies! Yum Yum!" Since Sam is never shown to have a wife and mentions Rebecca went through a lot before he adopted her, it begs the question of exactly what experiences Amanda/Rebecca has had with a Mom to have that kind of reaction.
Also, as she says that, the mother hen eats one of the chicks. There's no gore, and the chick is swallowed whole, but it's still disturbing.
Even the background scenery is disturbing, as the barn in the background has unblinking bloodshot eyes and is breathing heavily.
The daybreak ending. If you agree to share a secret with Amanda, she tells you that she's out there... somewhere. Then the TV starts going crazy, flipping between random footage from the show and what appears to be a human trying to claw through the screen. The only way to get it to stop is to destroy the TV by throwing a brick at it.
For the entire game, all of Amanda and Wooly's audio has had an appropriate "aged VHS tape" filter applied to it. When Amanda tells you her secret, that filter isn't there. As in, she's in the room with you behind the screen.
Cutting up the doll is already upsetting, but then she actually screams in agony when you do it. And another playthrough confirms that the doll is fully sentient.
It's never actually revealed what exactly happened to Kate. All we know is that she investigated the Amanda the Adventurer tapes and presumably died sometime into the investigation. It's heavily implied that Amanda is responsible for her passing.
In one of the secret tapes, someone is recording audio of Rebecca (Amanda's voice actor) reciting lines while her father Sam expresses increasing discomfort. However, when Rebecca continues without input she tells them both that there's a 'man in the headphones' telling her what to do. It's clear from both her father and the executive's reactions that there shouldn't be a voice in her headphones feeding her lines...
The words Rebecca is reading out may seem nonsensical until you realize what she's phonetically sounding out are the names of high ranking demons: Bael, Paimon and Balam. Just what is Hameln company messing with to have a little girl practice calling out demons during a recording session??
The secret orange tape is a home video showing a pair of parents trying to get their daughter Lauren to leave her room and come downstairs for her surprise birthday party. Lauren seemingly doesn't even hear her mother when she calls out to her; she just keeps staring at the TV, which is currently running an episode of Amanda the Adventurer. The parents remark on how obsessed Lauren has been with the show. After the dad attempts one last time to lure Lauren downstairs with her favorite ice cream, mint chocolate chip, both parents enter the room again to find that Lauren has vanished, seemingly having left the house. As the mom drops the camera to run outside and look for Lauren, we hear Amanda say this:
In one of the endings, Riley finds themselves trapped inside Amanda's cartoon world as one of the pieces of meat in the butcher's shop.
There's a hidden credit at the end of "In Your Neighborhood" that doesn't have anything to do with animation or writing: they're a Containment Specialist. Containing who? Rebecca? Sam? The ghosts of the entity's victims, including Rebecca and Sam? Demons?
. The model for Amanda's true form is stored right behind you the whole game.