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Plot hole: Spoiler; Under the pretense to help catching the murderer, the Judge goes through great lengths to enlist the help of the doctor to fake his own death. In this adaption it's made moot by the fact that the murder happens in the living room, his body needs to be carried upstairs and we even see that happen, with all the remaining survivors hauling the 'corpse' in their arms. One thing is faking with a little make-up (literally a paste-on red dot) to be shot in the head, with just the accomplice examining the supposed corpse, and the others at distance and with bad lighting. But with everyone carrying the body, including a police inspector and a PI who are accustomed to violence and real murder, it's plain impossible.

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Continuity mistake: When the 'sole' survivor walks into the supposedly empty house and spots the noose, it is placed quite high. When they walk back into the room with Owen, the noose is dangling low enough to nearly brush against his head. (01:31:35 - 01:32:25)

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Other mistake: In the flashback of the denouement, Dr. Armstrong is shown dead face down on the beach, with the feet pointed ashore and the head to the sea. Mr. Owen takes also a sip from that Armstrong's flask and tosses it in the sand without capping it. However, Vera and Lombard found a corpse face inland and feet to the sea, and a flask with its lid in place. (01:28:50 - 01:34:40)

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Revealing mistake: Mr. Owen's dramatic appearance begins with a precise pool shot. But Owen is standing behind the table in a position incompatible with the angle the ball was shot from - someone else out of frame must have performed that shot. (01:31:50)

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Continuity mistake: During the confrontation between Vera and Lombard at the beach, their hair is windblown with intensity that changes at every cut. (01:29:05)

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Stupidity: Lombard has already figured out who the person on the beach is, and that therefore Vera is the only remaining suspect - yet not only he never tries to take his gun back, but he leads her to the beach keeping his back constantly turned to her. That's incoherent with what he knows and how he acts later. (01:28:00)

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Continuity mistake: On the beach, Vera and Lombard are quite literally pointing fingers at each other...except they are not; new shot, different pose. (01:29:10)

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Plot hole: Blore's death is fairly absurd, since the killer couldn't plan that he'd be standing, with all the possible room outside of the house, exactly in that spot at that distance from the window, with a ton of bricks that are precariously balanced on stone spheres that survived storms and heavy winds but somehow are loose enough to require a gentle push to fall down. (01:25:30)

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Character mistake: The killer in the original novel (and as reminded also in this adaptation) stages his homicides following the nursery rhyme; goes through great lengths to do that, including planting a bumblebee in the room, using a hatchet, etc. But Blore's death has nothing to do with a bear, since he gets crushed by bricks. Conveniently the rhyme is not mentiones by the characters at all for his death, while they were the first ones to recite the matching verse in all the other deaths. In the original novel, Blore gets killed by a heavy object shaped like a bear.

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Continuity mistake: Inside Vera's room, she retorts "What about me?" when Lombard tells her his theory about who Mr. Owen is. The shots have different lighting, with either an overwhelming shadow from Lombard on her, or barely any shadow at all. (01:20:05)

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Continuity mistake: Lombard is protecting Vera's door, preventing the doctor from entering. Armstrong says "Oh but you will, you will." You can notice the double shadow projected by him, and Lombard's more marked but single one, mostly into the frame and not the actual door. Nobody moves candles of any kind in the next seconds, but when Armstrong after his explanation gets again in Lombard's face, Lombard is projecting a big shadow on the door and Armstrong none. (01:16:40)

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Continuity mistake: When the doctor proclaims the Judge dead, Lombard and Bloor's position on the door changes - they are close together, then more distant, then shoulder to shoulder again. (01:14:30)

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Continuity mistake: The doctor is watching the others when Lombard says he heard a shot. The close-up on Walter Huston shows him with a totally different facial expression compared to the previous and following shots, and the shadow he casts on the wall is also different (it's also incongruous, since in theory the only light comes from either his candles or those from others in front of him, but he projects a shadow to his side/front). (01:13:35)

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Character mistake: Blore accuses Lombard saying "What about those 21 poor natives in South Africa?" The record played during the first evening mentioned indeed 21 men, but that were natives of a tribe in East Africa. (00:14:20 - 01:10:10)

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Continuity mistake: When the Judge asks Blore to confess saying "We're listening, Mr. Blore", Blore is clutching the napkin. As he begins to speak in a new shot, the cloth is gone from his hand. (01:09:50)

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Continuity mistake: Blore gets up irate after Quincannon and Armstrong's confessions; the Judge next to him had both hands on the table, but he has just the right one in the new shot. (01:09:30)

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Continuity mistake: Dinner after Quincannon and Armstrong bonded at the pool table. The Judge says "Very well, I shall begin." Blore is still using the cutlery on his plate, but he has both hands off the table at the cut. (01:08:25)

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Revealing mistake: Dr. Armstrong uses his lighter, which, true to its name, lights the room. The whole room, with a disproportionate intensity. Even if you consider it as an acceptable exaggeration for practical purposes, especially in such old motion pictures, the set lights are turned on with half a second of delay, making the trick painfully obvious. (01:07:40)

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Continuity mistake: When the Doctor and the Judge realise that they are on their own at the billiard table, the Judge holds his cue stick towards the left, right, left. (01:05:25)

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Continuity mistake: When Lombard tells Vera "Don't you think it's strange that there's never a third person present when anything unpleasant occurs?" his cigarette is in the left hand, and switches instantly to the right in the next shot. (01:03:35)

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