No eye mutilation, there is a section where an eye is transformed and looks like half of a face is missing. This is in the back half of the movie once the couple are on the road and sitting in a church.
No eating disorder present, but there is a monster transformation that could be described as a petite women who suffers from anorexia in body shape and portrayal. It is clearly painted as a monster transformation scene, but the imagery may remind someone of it.
Most of the movie is shot without a tripod and so shakes. Not as much as most found footage movies, but it is noticeably moving around and not a steadyshot.
The Englishman tells a kinda mean story about his ex getting fat.
There is also some weird dialogue about a specific (very thin) characters weight, during which it is implied she is “healthy” as in not... thin? Obesity is described as unattractive during this conversation.
No actual relationships, but they are discussed jokingly multiple times in a banter way like "oh you wouldn't do that that'd be incest". So, discussed/mentioned but never happens or has the potential to happen or a scene leadup.
Yes, between monster tentacles and tendrils and transformations as well as dead animals in varied states of decay and brutal murder there is a bunch of animal gore and fish person transformation leftovers.