Sammo

Continuity mistake: Dinner on the ship; Miss Quinton takes her nameplate just as a waiter is serving the woman next to Lady Westholme. The man between them is looking in opposite directions in the two shots. (00:14:30)

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Other mistake: In Trieste, Carol comments that someone should be with their mother; it seems to be a comment to the fact that she just tripped as it is shown in a wide angle. However, a conversation ensues and Ginevra at the end of it sees through the telescope...her mother trip, again. To make the event even more baffling, Ginny couldn't have witnessed the event from the promenade viewer, the angle is completely wrong. (00:08:45 - 00:09:10)

Sammo ★

Audio problem: During the fireworks, Poirot's line about the "nice and royal" show giving him "confidence" is dubbed over, and you can in fact see Peter Ustinov in the shot of the crowd, not saying those words. (01:37:40)

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Audio problem: When Poirot stands from his seat after telling the truth about the spider, he looks at Dr. King. Her lips move but there is no audio. (01:33:50)

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Other mistake: The spider scene is wildly different when Poirot narrates it at the dinner table (Miss Quinton immediately replies "Oh yes, spiders don't frighten me") compared to the actual scene (she said that replying to a different line). (01:12:20 - 01:33:40)

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Revealing mistake: In the close-up of the killer's revolver firing, the revolver is...clearly not firing. It's just the sound dubbed in, but there's no flash or discharge of any kind. (01:33:10)

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Continuity mistake: During the coronation ball, Poirot explains that the murder must have not been intimate enough with the victim to tamper with the heart tonic. As he says that, his pince-nez are on his lap, but they are in his breast pocket a moment later, and it switches position again when it gets back to the same camera angle. (01:29:30)

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Continuity mistake: When Lennox picks the wristwatch from his mother's lap showing the actual events, the natural light of the scene is entirely different between shots - the skirt is sunlit in close-up, in the shade in the other angle. (01:25:45)

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Continuity mistake: When Nadine gets up from the chair to confront Poirot about implicating young Ginevra, she puts in a haste her shawl on the plate in front of her, but it's perfectly rolled in during the rest of the scene except another shot. (01:23:35)

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Continuity mistake: Poirot runs through the hypothesis that Carol murdered her stepmother. In the middle of it there's a close-up on Miss Quinton smoking a cigarette, but in the wide shot immediately following that, she isn't. (01:21:10)

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Continuity mistake: When Poirot in his teatime speech addresses Raymond Boynton, there's a close-up on Dr. Sarah King looking at Poirot defiantly. There's no direct sunlight on her, but then there she is, sitting next to Raymond with sun all over the chest and left shoulder and cheek. (01:19:50)

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Continuity mistake: At the denouement during afternoon tea, Poirot opens his statement greeting "Ladies and gentlemen." Look at Lady Westholme's table; she and Miss Quinton in the wide shot turn towards Poirot to listen, but in the next shot they are in an entirely different position (Lauren Bacall has her hand under her chin, then on the table, Hayley Mills puts her hand in her lap, then she has her forearm on the back of the chair). (01:19:10)

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Continuity mistake: When Dr. King drops the gun, in close-up it bounces on the back of the thigh of the victim, but in the previous shot she tossed it nowhere near that spot. (01:16:55)

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Plot hole: The movie at best is being dishonest with the ending of the chase scene; to keep Dr. King as a possible suspect, the gunshot happens so shortly after she went out of frame (with no cuts) that (since she is -NOT - the killer) there is no possible way that the gun could have ended in her hand. There's also no possible way for the culprit to escape, to find Hassan in the crowd and be there at the perfect moment, etc. (01:16:35)

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Continuity mistake: On the final day of the mystery, Doctor King apologizes to Poirot at the concierge. Poirot's reading glasses are located in his pocket, towards the left or center, as we can tell by the straps. When the two are coming out of the hotel, the glasses shifted to the right corner of the pocket. (01:14:40)

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Continuity mistake: Carbury brings Poirot the report with the results of the questioning of the various "Arab boys." Poirot sets it on the counter of the hotel's bar. The colonel does not touch it until later, when he does it's turned differently. (01:13:00 - 01:13:25)

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Continuity mistake: After the spider scene, colonel Carbury and a certain Captain Rogers (not that one) approach Poirot; suddenly at the entrance behind them there are people who weren't there a moment before. (01:12:35)

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Stupidity: Poirot addresses the person in the shadow outside the hotel as "dear sir or madam", which would make sense given the clothes, but makes no sense with the fact that voice is definitely a male voice, there's no mystery at all there. (01:11:50)

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Continuity mistake: In the cave, Raymond turns his back to Poirot casually saying that his mother was "pretty upset." Notice the sweater he threw on over the shoulder. Cut to a couple seconds-long flashback with his mom hilariously overreacting, and when we see him again the sweater is on his shoulder in a completely different way, as you can see from the decorations. (01:09:55)

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Continuity mistake: Poirot and colonel Carbury are going up a flight of stairs when the Belgian poses to his positively baffled friend a few questions. Before the camera cuts the first time, Carbury takes in his right hand the baton he was carrying under the left armpit, but in the next shot it's back exactly where it was. (01:06:10)

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