Penny dislocates her shoulder after falling in the shower, we don't see this happen and the injury is not realistic at all. However, most of the episode is about this injury
Several times throughout the series, it is mentioned that Howard's father left him and his mother when he was young. It's a traumatic memory for Howard and features in many episodes.
In S6 E10 "The Fish Guts Displacement" Sheldon spanks Amy. While it is implied that she secretly enjoys this, he does this to her under the impression that it is non-consensual or at least not wanted.
Characters frequently lie to get out of someone being mad at them or to get something they want. Though I wouldn't call it gaslighting because it's never a case of trying to make someone doubt their perception of reality, the characters can be very manipulative in their lying sometimes, so it could still be a trigger for some.
one of the main characters frequently tries to flirt, and in one episode, he tries getting a robot to look up a womans skirt, many times played for laughs
Characters walking up and down stairs is a common theme in the series. Characters are not actually shown falling down the stairs, but the sounds of characters falling down the stairs can be heard off-screen a couple times in the series.
leonard also made out with someone while he was in a relationship with priya, and when he calls her to tell her she reveals that she slept with someone else
In S2 Ep 9 Leonard v***ts in the sink after cutting his finger with glass after trying to open a jar. There is audio but no visual. When he shows the stitches he got to Howard, Howard g*gs.
In S3 Ep 2, Leonard v***ts in Penny's toilet after drinking too much. Although we see him in the shot, we do not see any v***t. A few lines after, Penny v***ts into her sink. Again, we see it happen and hear audio but we do not see any v***t.
In S3 Ep 15, we hear Penny v***t just before the 18-minute mark, after we see her blowing her nose. This lasts for around a minute, no visuals. Sheldon then does the same, lasts for around another minute, triggering audio.
Maybe not technically since the character is never specifically confirmed to be bisexual and the flirting is played for jokes, but Amy often has a (creepy and unrequited) attraction to Penny that goes beyond friendship, even though she is dating Sheldon.
Yes, multiple times throughout the film, but no gore or surgery is showed. They just show a waiting room, and once or twice a hospital room. There is a scene or two where a character is in an isolated room because they might’ve been exposed to a bacteria, but yet again, no gore.
Sheldon is autism-coded (he isn't confirmed to have autism, but it is obvious that he does). I don't think it's misrepresented, though. I have autism and I am very similar to Sheldon.
There is no actual ABA therapy but in one episode Amy tries to "train" Sheldon out of one of his autistic traits (having intense trouble with lack of closure / resolution), and she uses similar methods
sheldon has claustrophobia and goes in the university steam pipe tunnels and gets very scared, he can get out at any moment though and got in voluntarily, i dont know if that helps. they also play dungeons and dragons and at one point leonard describes how the walls are closing in on them.
Sheldon’s friends constantly make fun of autistic traits he displays. A cast member has said the majority of the main characters are neurodivergent in some way, and since it is a sitcom, all of them are mocked for their personalities and quirks often.
Raj's friends consistently refer to him as a woman, as well as making jokes about Penny's "mannish" features. A character once says he's glad he doesn't have to wonder if Penny is "really a man down there". A trans woman used to live across the hall from Leonard and Sheldon that they both refer to as a man.
Characters constantly make fun of Sheldon's lack of sexual attraction to anyone throughout the series. Amy, Sheldon's girlfriend, constantly complains how he won't have sex with her.
Nearly all jokes revolve around racist and antisemitic stereotypes, especially of Raj, Howard, and their families. Constant sexism, homophobia, and transphobia.
An episode's plot revolves around Sheldon and Kripke fighting for an office after a minor character at the university is forced to retire due to his advanced dementia. He appears briefly in the episode and behaves in a way consistent with dementia (or at least the way a TV show depicts it).
In a episode where the characters wonder where'd they'd all be if they never met Sheldon, there is an imaginary scenario where Leonard and Raj are living together and are fat. Stuart inserts himself into the fantasy, also fat. The actors are shown in fat suits.