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Continuity mistake: When Blanc crouches by Helen telling her that "This is our cover", she is holding the diary with both hands, but in the previous shot her left hand was on the ground, and switches again back and forth. (01:45:10)

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Plot hole: Helen looks at her phone for the first time at 9:58. From there, she quickly browses the messages everyone has been sending for several minutes to her, and does a google search. Since she gets interrupted by Whiskey and then this interruption is further interrupted by the hourly 'Dong', she must have ransacked Duke's apartment in barely a minute, which is impossibly fast. (01:41:20)

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Stupidity: The whole thing about the Klear energy source is that it is solid hydrogen. Claire as the governor of Connecticut supposedly signed off an entire power plant based on it. Yet not only she is mighty surprised about the fact that it has potentially flammable issues (but she herself brings up the Hindenburg), but also the whole meaning of Miles' machination down to the presence of the Mona Lisa, is to impress world leaders and 'unveil the future' showing that his home is powered by it. That does not make sense; if the energy source is so experimental that a single house powered by it is gonna be such a breathtaking reveal, there can't be a whole power plant in a major US state already signed off on that technology, that somehow involves literally piping the gas through homes.

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Continuity mistake: When at the restaurant Blanc says the anti-prophetic sentence "Miles Bron is not an idiot", his arms go from folded to unfolded and vice versa between shots. (01:19:25)

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Other mistake: Miles explains the presence of the white bracelets that the Efficient Man slapped on their wrists as biorhythm monitors that act as keys for their room, each assigned to a chakra. Blanc's presence was not expected or announced, but not only Ethan Hawke had an unexplained spare bracelet, but he is also assigned a room, when there are 7 chakras and he brings the guest count to 8. It should also be noted that supposedly they are the "key" to each room, and yet Andi comes and goes from them as it pleases her (ironically the very sort of mistake that birthed the term "Fridge logic") and nobody wears them for the rest of the movie at all because the gag ran its course.

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Continuity mistake: In the reveal of the crime that hasn't been committed yet, Blanc points at the table to show the trajectory of the dart. Claire suddenly stands from her seat, but she is back sitting properly a moment later. (00:48:05)

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Continuity mistake: After Andi's mic-drop moment interrupting Miles ' speech, Claire runs after her. Birdie is biting her fingernail, with a different position in close-up (her other fingers are up in the wider angle, lowered to let you get a better view of Kate Hudson later). (00:36:25)

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Continuity mistake: When Birdie makes her way poolside she smiles at Lionel; in her slo-mo approach her left hand holds the foulard, but in the next shot she is holding the brim of her hat. (00:27:50)

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Factual error: A major plot point revolves around the fact that the police and medical staff can't reach the island because the "Pisceshite" dock is non-buoyant and they need to wait for the low tide. While we do not know exactly where the fictional island is, other than the fact that it's 2 hours off the coast of Greece and Blanc mentions (correcting Miles Bron) that it's in the Aegean sea and not the Ionian sea, it's fair to say that the tides in that area of the Mediterranean are negligible, not reaching even a meter in very selected spots, and averaging at mere centimeters. It's nothing that would impede navigation and police or medical team to arrive. (01:02:30)

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Revealing mistake: When Buck and the gang ride away from the saloon in Dallas where JC made a few new 'friends', the footage is sped-up for a second just as soon as James Caan jumps on his horse. (00:05:50)

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Plot hole: There is a pivotal moment when Duke poolside casually says; "remember that night when..." That is a mighty strange way for him to mention the very last time the two met, barely two weeks earlier. Miles was not even supposed to be in the country, but Duke, who later jumps straight to casual blackmail once he gets the Google alert about Andi, never mentions that to Miles before or since. Miles cut him off pretending he meant "Anderson Cooper", but for the rest of the movie he struggles and has no leverage on Miles to the point that he pimps his girlfriend out to him. Furthermore, he mentioned the "pancaking" to the other friends, but somehow never mentioned it was Miles. If he was not going to take advantage of that, then he had no reason at all to keep the secret, especially with the lot of them hanging out for an hour waiting at Andi's door. Anyone would have mentioned the fact already back then, or if they realised it was important, would have already started to use it.

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Continuity mistake: Miles tries to rally the troops after Helen delivered the line about him being ruined. He calls out "Gang?" Lionel is staring into space facing away from him, then in close-up he is still staring into space, but turned more towards him. (02:09:40)

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Audio problem: Helen reminds Miles the line he used "To forever be remembered in the same breath as the Mona Lisa." The line is said in the span of a couple different angles; when she says the word "in the same", the camera is behind her, and you can see that her jaw is not moving. (02:09:15)

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Stupidity: Of course, it's a movie with a heavy comedic tone and it's a rather cathartic scene, but still it's worth noting that Benoit Blanc had no way to know that making the whole HOUSE (full of glass shrapnel, too) explode wouldn't gravely injure or kill anyone. What a ruthless fellow.

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Continuity mistake: The bloodstains on Helen's top change midway through the ending. For instance, when she walks towards Miles after smashing most of the glass sculptures to eventually show him her trump card, she has a visible red spot on her right breast (which you could see earlier even when she was wearing her blazer), gone when she gets up from the floor after the explosion. (02:05:00)

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Continuity mistake: In the close-up of Helen igniting the alcohol on the floor, she moves the arm away from the floor and all the way out of frame, appearing also to get up from her kneeling position. A few seconds later in the wider view of the room she is still with her hand down. (02:04:15)

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Continuity mistake: When Helen is bashing the bar, the gestures of the other characters in the background are inconsistent from shot to shot (just look at Kate Hudson and Kathryn Hahn's reaction shots, for instance). Same when a few seconds later she throws pillows in the fire. (02:04:00)

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Continuity mistake: Helen pleads someone to say "I saw the napkin before he burned it." In the background, Miles is standing, hands down his sides. The camera cuts awa a split second on Claire and Lionel, and then there's a close-up of Edward Norton leaning with the back, and the palms of his hands, against the table. Same few moments later. (02:00:10)

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Other mistake: In the original version and in the flashback, Benoit Blanc's delivers the lines about the "loaded gun on the table" in a different way and gestures differently throughout it. (01:56:10)

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Plot hole: It's an established fact that the culprit is an idiot (actual quote), but still, not a COMPLETE idiot. Some things such as keeping the envelope as some sort of trophy are in line with the hubris of villains, but there's absolutely no reason at all why he would still have in the back pocket of his pants Duke's phone after having a ton of time to get rid of it (he got rid of the gun and a pair of gloves he had the time to go look for in the dark too), especially in a spot so visible and being known for not owning any phone himself. (01:53:40)

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