While not shown it's mentioned in the good ending of dsaf 2 that the company the characters work for sent a character off to Vegas with a brick of cocaine hoping he'd overdose, the character remains alive.
A character is said to have been abandoned by someone who he saw as a father figure, however at the time he was an adult. The same character is stated to have been an orphan, it being implied he was abandoned by his bio parents.
As stated by the creator in a tumblr ask/post, Henry's father was abusive to him growing up, and it is stated that Henry often mutilated William -who adopted Henry's son's name David- in grotesque ways, and grew to hate him for taking his deceased biological son's name.
In DSAF 3, the player gets stalked by Dave if they refuse to bring him to their new restaurant. In one route, Dave notes how he has security cameras installed around the player’s house.
Children are murdered throughout the series, one being noted as particularly grusome. Another character who made it to adulthood is implied to have been abused in his childhood.
Jokes here and there about things like “leaving with your hymen intact” being a dialogue option or people saying Matt the virgin is “a creep” and “what is fucks your’e bitch r*pe” (spelled like that I have no idea what it means and I think that’s intentional )
Multiple character are inferred to have had their heads squished into phones with it being described to have happened in a character's backstory (however this character is mentioned to be a horrible person and getting his comeuppance)
The main character is missing two front teeth, and is stated to have lost them via another character hitting him with a hand crank. This is only said outside of the game by the creator however
It is stated that Peter (DSaF2 Phone guy) attempted to crucify Dave Miller (Purple Guy) to get rid of him. As well as tapes in Dayshift 3, stating Henry had done nonconsensual procedures on Dave in his sleep, following his first spring lock failure.
In dsaf 3 an antagonist abducts an infant with the intent to kill (in the bad ending the player helps him) however in the good endings the player stops him and the infant is presumably returned to it's parents
There are moments where there are hallucinations in the second game of a ghostly dog, and a majority of the good route of the third game is especially due to going into another form of reality, leading to a grotesque landscape in the form of the "Void"
It is inferred that the long since "dead" Henry, is watching over everything, as Dave comments after you insult Henry while discussing the past with him in the second game: "It's rude to talk about someone who's listening."
Davetrap is seen in the third game, peering through your window when you get home after seeing him at the Utah Location (Night 3)
The m slur is used and a cop with dwarfism is dressed in a baby mask, playing on the “people with dwarfism are children, look like children or should be infantilized” trope. “Psychopath” and “crazy” are used a lot
optional dialogue from the first game, it’s not extreme and the series matures afterwards, you have the option to make a joke about jews and your character says “curse phone guy and his jewish ways”
The creator of the series, DirectDoggo, has not explicitly stated that any characters are LGBT, but a couple of major characters are implied to be mlm. In quite a few endings in all three games, one (or both) of these characters die.
Spring lock scenes as well as multiple times in cutscenes blood is shown. A lot of concepts in this game are gorey and disturbing, however a lot of it is in dialogue