My thoughts
1). The first 60-65% of the movie takes place in a crowded arena, which we should presume would have working cameras (especially with the FBI set-up to catch Harnett). We indeed see one scene when Lady Raven talks to the old FBI lady backstage. The scene occurs in a room where the FBI is watching video surveillance, so there were cameras set-up in the arena.
2). Given the above ^ ... when Hartnett pushes the girl down the stairs and drops those bottles in the fryer, is the audience meant to believe that nobody in the crowded arena actually sees him? And how is it possible that none of the cameras catch him in those actions? When the girl gets burned, they have to bring an ambulance to take her away. Did none of the FBI agents think, "Hey, lemme watch the video footage to see how this incident happened"
3). Hartnett at one point takes one of the officer's radios. He sets up a very conspicuous ear-piece to listen to them, and he walks around the crowded arena with the ear-piece showing. In that crowded arena with thorough video surveillance, nobody said, "Hey ... why is that civilian walking around with an ear-piece"?
4). The idea that Hartnett happens to meet a low-ranking vendor worker who spills the beans on the whole operation, even giving Hartnett the code-word, is quite convenient. I have to wonder why the FBI would even tell this low-ranking minimum wage vendor worker all this important information too. That Harnett could grab his vendor's keycard from his back-pocket is also quite convenient
5). The radio indicates that the FBI suspects the Butcher may have a tattoo of a rabbit on his wrist. So Hartnett happens to notice that the person sitting in front of him has a wristband: I find that occurrence to be way too convenient
6). Hartnett's daughter explains to him that Lady Raven brings a fangirl on stage for her 2nd to last song. So Hartnett just happens to go talk to a random Indian dude, who happens to be Lady Raven's uncle. Did Hartnett know or suspect that this random guy would be Lady Raven's uncle? And how convenient that Lady Raven's uncle buys Hartnett's story about cancer, and then how convenient that Lady Raven's uncle decides to choose Hartnett's daughter to go on stage
7). The movie gets into details involving the daughter's beef with two other girls. This plot detail goes nowhere at the end though, so M. Night put this plot detail in the movie just to throw the viewers off with a red herring or something?
8). Hartnett conveniently has a tunnel that goes to the neighbor's place. But how did he manage to subdue a SWAT officer and don the SWAT gear so quickly? What happened to Lady Raven's driver, the black dude? How did none of the SWAT officers see Hartnett during all of these events?
9). The limo is surrounded by a mass of people watching Hartnett, the suspicious guy dressed like a SWAT officer while driving a world-famous pop-star. How did Hartnett manage to change his clothes so quickly, exit the vehicle, and blend in the crowd without anyone seeing or noticing him?
10). The FBI knows that Hartnett is the Butcher, a violent serial killer. So when they catch him in the kitchen at the end, why are trying to subdue him with tasers? Since he's a killer, they would shoot to kill. Instead, he ends up taking out an officer's eyes
11). Related to #10, they know he's an elusive serial killer. Why did they allow him to go near the bicycle, and why did they allow the daughter to go hug him? Both are risky actions, especially the latter
12). Lady Raven talks to the FBI lady backstage, who gives privileged information about their search for a violent serial killer. Why is the FBI giving Lady Raven, a pop-star, this kind of briefing? In the car scene, Lady Raven starts talking like Hartnett's mother to trip him up, to which Hartnett says that "they've been telling you things." Again, why did the FBI give Lady Raven this privileged information about Hartnett's character, such as his mother issues? Is Lady Raven an FBI agent or something?
13). Why would the driver allow Lady Raven to go alone inside the house of a family she doesn't know? We're led to believe that Lady Raven is a pop star on the level of Olivia Rodrigo or Dua Lipa. Wouldn't she require some kind of escort or security in case this family tries to kidnap her or hurt her? The audience has to strain belief to accept that the driver would let her go all alone inside that house filled with people she doesn't know
14). At the end, the wife is really the one to deliver the "trap," and she does the big reveal where she admits that she tipped off the FBI. I found this part to be an unsatisfying conclusion. I feel the daughter should have delivered the "kill" at the end because most of the movie developed the father-daughter relationship: the daughter would've made that scene more emotionally charged than the wife did
15). The post-credits scene was quite unnecessary and unfunny