A few movies in which dogs die are mentioned, you see explicitly the scene in The Thing (1982) where the thing is mimicking a dog and there is some weird alien body horror that starts off with a dog.
The movie Cujo is also mentioned with some scenes from it. (but not the ending)
They discuss & show clips of the tree scene in Evil Dead, the crotch/weapon scenes in Nightmare & Texas Chainsaw Massacre 2, and the "head gives head" scene in Reanimater.
No full scenes for any of these, but they do explicitly talk about them and the exploitive nature of real life actresses being coerced into nudity for films.
They show various jumpscares throughout the documentary, though they don't have the same buildup/effect as in a movie. If you've seen the movies discussed you may already know they're coming as well
Specifically, there's a few werewolf transformation sequences that have some body horror involving hands/feet and some scenes from Nightmare on elm street franchise where fingers are cut off
The movie Cujo is also mentioned with some scenes from it. (but not the ending)