Suguha was treated very harshly by her grandfather which she deeply internalized and caused her to be emotionally and physically abusive to others including her brother/cousin and crush (…that sentence is not supposed to be about the same person unlike canon LOL)
Some of the more infamous scenes of the Fairy Dance Arc are heavily altered or removed but the subject is at least brought up a few times for example a minor participates in an online RP that involves a non-con scenario but doesn’t get far and the slug scene at least references its notorious original context by way of one of them awkwardly lying about his intentions
Particularly played for laughs in the first episode where you think the language will at least be censored but it’s revealed that it’s actually the in-universe profanity filter. Once it’s turned off you hear the swearing in all its glory. Season 2 also involves a game with a in-universe profanity filter but it’s more like The Good Place with words swapped out with family friendly ones such as “fudge” instead of “fuck”, once again swearing is otherwise not censored outside of the game
Joke in the first episode about a crossplayer that catfishes another player, unlike the original series though they quickly get over this fact and continue the relationship with their online partner (albeit see “age gap” with a bit of a caveat)
Implied with the “and you’re not 17” joke, especially since they continue their relationship after finding out the truth. In addition to the arranged marriage with Sugou and Asuna