Street workers removing (and dropping in the process) the charred remains of a cat is shown close-up and graphic at 00:38:19 - 00:38:35.
A dead baby bird is shown close-up for 5 seconds starting at 00:39:55. A mortally wounded sheep (appears to have been attacked by a wolf or similar predator) is shown from mid-range (as Evan looks over the side of a cliff). It's then shown closer up. We can see the level of decay and a snake moving through it's skull. Skip 00:47:47 - 00:48:02.
Bunny is sacrificed. It's most likely faked and it's obvious by the camera angles and cuts but skip 00:56:22 - 00:56:34. She then begins eating the dead bunny, tearing at its raw flesh, at 00:57:27.
At 00:57:40 a Centipede? Octopus? ?? feeding on bird carcass is shown.
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.
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.