Leeches crawl out of a puppet's mouth in a way that could definitely be triggering for those sensitive to this. In another scene, the same puppet "vomits" out a leech into a human character's mouth. He has a liquid spilling out the sides of his mouth.
Yes, it happens very early on in the movie, by a gunshot. Later in the movie, a character puts a gun in their mouth for shock value, but immediately removes it.
I'm sure there are more, but one big example I can think of is that each of the puppets makes small, breathy noises constantly any time they're on screen.
Not really, but there are, as the movie title suggests, many scary puppets/dolls, including one that is a jester, but only in name - he has a frilly collar but otherwise looks normal, and his gimmick is that his face changes expression like theatre masks. There is also a human wearing a plain white mask in this movie.
In a way - the group all have different psychic abilities, one character is often overcome with emotion from reliving the experiences of previous hotel guests.
One puppet spits out leeches in a very graphic manner. One leech gets spit into anither character's mouth, and liquid is seen spilling out of his mouth afterwards.
The psychic woman experiences a vision of a rape in the elevator, and one of the puppets sexually assaults the man tied to the bed after his sexual partner is killed.