Spoilers Off applies to the Moments subpages. BEWARE OF UNMARKED SPOILERS
In the beginning of the movie, the ghost of Edith's mother. While her intentions are ultimately benevolent, her appearance and voice are freaky as hell. And then there's the message she gives to young Edith, which is very creepy:
Edith's mother: My child...When the time comes....beware of Crimson Peak!
Carter's death. He gets beaten to death in the bathroom, opening a hole in his head and crushing his nose. Edith was truly shocked when identifying the corpse.
Allerdale Hall in general in simply anxiety inducing. There's a massive hole in the ceiling, and with the way the wind blows through the halls, it reverberates and makes an endless groaning noise all throughout. Never mind how the entire building is slowly sinking into the clay mines, saturating not just the plumbing, but it also leaks through the walls, making it look like the entire house is bleeding. It doesn't get much better when winter comes and snow falls, since the liquid clay rises to the surface, mixes into the snow and looks like blood soaking into white fabric, giving the place its nickname, "Crimson Peak".
The second ghost Edith meets in Allerdale Hall. Edith thinks the dog is actually hiding in a closet. Then the dog appears and she realizes who could have been the cause of the noise inside the closet. Suddenly, a face with big eyes appears from the closet.
The eerie wind from the east that blows in the house. Because it blows through certain places, it sounds like a ghostly moan and Thomas tells Edith that it makes the house to sound like it's breathing.
The finale. After accidentally killing her brother in a fit of rage, Lucille absolutely loses it and goes after Edith with a massive cleaver, chasing her out of the manor and into the blizzard outside. The blizzard conceals where Lucille is from Edith for the most part, and we're treated to quick blurs of Lucille darting this way and that.
Allerdale Hall itself is a piece of work. One of the most foreboding and menacing looking manors out there.
The red clay that place is built on makes the house appear to bleed several times throughout the movie.
Thomas being stabbed in the face, and then pulling the knife out. Bloodless Carnage makes it worse.
Given how long it takes to pull the knife out again, that knife went in there deep. Worse still, when his ghost appears, the hole in his face is sluggishly leaking little tendrils of blood that hang in the air like smoke.
Lucille's description of her mother's sickeningly brutal abuse at the hands of her father, and subsequently the children's own abuse at the hands of their mother. She describes her father breaking their mother's leg by stomping on it, in such a manner that it would never fully heal, in a way that suggests she may well have witnessed it firsthand.
Edith playing the gramophone recordings during the first part of The Reveal. What is at first a married woman playing around with a recording device later becomes deathbed recordings about what the Sharpe siblings have done to her.
The ghostly memory of Lady Sharpe's death. Edith overhears a woman screaming in terror, followed by a loud SHINK!, followed by the woman going dead silent and the bath water sloshing around loudly and clearly now that she's no longer screaming or struggling... followed by the sound of a young girl giggling. Edith then walks in to find the ghost of an old woman dead with a cleaver in her head in a Deadly Bath. Once it's revealed that Lucille killed her at age 14, it takes on an extra level of horror. The frantic screaming before the murder hints that 14-year-old Lucille brandished the weapon to let her know she was about to die, and possibly taunting her with the fact that she was too crippled to escape or defend herself, instead of hiding the weapon until right before the killing blow or charging at her quickly. Lucille's laughter after the death blow further hints that she had taken sadistic pleasure in stoking her mother's fear before chopping into her head. Brrr...
Even without the ghosts, the premise is still terrifying: a young woman is essentially a prisoner in her new husband’s isolated home. He and his creepy sister, who clearly hates her, are the only people she interacts with regularly, she's getting sick but doesn’t know why and she has a feeling there is something terribly wrong, but her husband and sister-in-law are intentionally evasive, leading her to wonder just who she's married in the first place. And then, she discovers that her new family is actually plotting to murder her, they have done this several times before and there is no one coming to save her and no way to escape.
