At the very beginning of the game, during a flashback to the protagonist's childhood, he's forced by his abusive father to kill his dog. If he doesn't do it himself, the father will shoot it himself.
There's a first person view where the main protagonist gets decapitated and is presumed dead by the enemy. It's then followed by a close up shot of his decapitated head held up by the enemy. The head is then thrown down into a pit of fire.
There's a several minute long scene where they show you how BJ gets saved and how his head gets transplanted on a new body.
Private Wyatt if you choose his timeline has a plot thread about him trying out drugs given to him by a character named J (whom is likely jimi hendrix) however this is an optional thread as if you choose the fergus timeline this won't be there
there is a lot of alcohol use however it appears to mostly be at parties like fergus getting really drunk and Paris Jack's group of anarchists make alcohol
A lot of the game's plot revolves around teaming up with a group of mostly Black resistance fighters who are pretty clearly inspired by the Black Panthers. Their leader has a backstory about being framed for murder by the FBI.
The protagonist's father in his childhood segments is horribly racist, and hates the fact that the protagonist has a black friend, using the N-word to refer to her.
Nazis are a major antagonist. The game pulls no punches about what a nasty bunch they were. Hitler himself (decrepit, nuttier than squirrel poo, and raving about conspiracies) cameos.
The game is centered around the concept that N**i Germany won WWII so antisemitism is a large part of the game and there is a lot of antisemitic hate speech throughout the story.
An incredibly sudden (fully clothed) s*x scene is shown briefly inside of a submarine between two side characters. It's meant to be funny, but it's just uncomfortable.