Technically, as one of the ghosts is a man who seems to be coming home from work on the tube when he's killed. During the theater scene he mentions that David made his wife a widow and his children fatherless. They're likely grieving his loss, which would be influenced by the fact he never arrived home safely during what's presumably part of his daily routine. It's obviously not deliberate abandonment, but may be triggering in a similar vein.
There's no actual pedophilia, but there is a scene that might potentially be triggering. After David's first transformation he wakes up naked inside a wolf enclosure at the zoo. He hides in the bushes and tricks a local child into giving him his balloons so that he can cover his privates (as the child puts it 'a naked American man stole my balloons'). It's very obviously not sexually predatory in any sense, as David does not expose himself to the kid or have any sexual intentions, and contextually it's a comedic scene, but it may still be upsetting to some viewers.
Not torture so to speak, but the first transformation sequence does involve a lot of screaming and someone being in extreme pain, which is possibly worth mentioning in this category.
In the last quarter or so of the movie, there are some people and their dogs sitting around a fire pit. The holes in the sides of the firepit bin are triggering. Is only there for a scene or two.
Technically speaking, no character in the film dies via suicide. There is a lot of suicide talk, however, as the protagonist is constantly told to kill himself and is even given methods of doing so. There is also a suicide attempt scene, where he tries to cut his wrist inside a phone booth but fails to go through with it.
There's a dream sequence where David's family is attacked by werewolf demon Nazis in such a way that's clearly intended to invoke Holocaust imagery. One piece of official merch refers to them as 'nightmare demons,' and Jack mentions that the forces of darkness are real, which raises the possibility that these are actual demons. Other than that, the supernatural horror comes from ghosts and werewolves, not demons.
Three of the ghosts are shown huddling around a fire in a trash can when they are killed. This implies that they were homeless, which makes them easy prey for the werewolf rampaging that night.
There is lots of blood and some pretty knarly body horror. The worst of it, imo, which is the main transformation sequence, happens from 00:59:20 to 01:01:15. Lots of hair, disfigured limbs, audio gore, you name it.