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Continuity mistake: When Mrs. Van Schuyler mentions a "popping sound", David Niven's position is different in the two takes; first his hands touch, then he suddenly has one hand on the armrest. Similarly, when she mentions "an indifferent champagne" her hand is on her embroidery, but she was gesticulating away from it before the cut. It's then Peter Ustinov's turn to be inconsistent; Niven asks "Could it have been a small pistol" etc. and Ustinov is fingering his moustache, but in the next shot he isn't. (01:29:00)

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Continuity mistake: Race hears Poirot's morse code and grabs his mighty swordstick; look at his tie. When he's inside Poirot's room, his Royal Green Jackets tie is styled different; in his own room the small end reach approximately the second-to-last red diagonal stripe of the wide part, while in Poirot's room the small end reaches barely the third-to-last stripe. (01:26:40 - 01:27:15)

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Other mistake: In the origin story of Poirot's facial hair, we see the damage on his cheek is massive, well into the cheekbone. His girlfriend says he'll grow a moustache to cover it, and surprisingly, it works - nevermind the fact that scar tissue wouldn't grow hair. When we see the scar without the moustache, while smaller than the initial damage, it still extends into the cheek at the level of the nostrils in a way that the 'stache couldn't seamlessly cover like in the rest of the movie and its prequel.

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Character mistake: The second screen of Nutaku's "ending" begins with quotation marks that never close - and they were never supposed to be there in the first place, her line begins only a few words later.

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Revealing mistake: When the ghosts are released from the storage unit, there's a shot of the light beam followed by a wide panoramic view of New York where the ghost lights depart as strings and orbs of energy. If you look at the Empire State Building, you can see that the first orb supposedly passes behind it, but its outline can be in fact seen through it. (01:09:05)

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Character mistake: Peter tells Egon over the phone that he gave Dana "300 cc of Thorazine." Besides the funny implications the movie ignores on how and why he was in possession of it, Venkman says "cc", but the drug is dosed in mg, so at the very least Venkman misspoke (that'd be 1/3 liters!). The line is not in the shooting script and other sources like the novelization just say that Dana had some valium lying around. (01:02:30)

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Continuity mistake: Dealing with Tully, Annie Potts says one rather oddly foreshadowing line to Harold Ramis about his death, and then clings to him. Ramis puts a hand on her shoulder, and the position is different in the next shot. (01:02:00)

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Continuity mistake: When Venkman is in Dana's bedroom the quantity and quality of light coming through the window changes between shots; look at the side of the window when he is counting down, for instance. (00:58:30)

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Continuity mistake: During the scene with the possessed Dana in bed with Peter, the pillows rest at different heights against the bed's headboard. (00:57:30 - 00:58:40)

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Continuity mistake: When the possessed Dana asks Peter for the second time "Are you the Keymaster?", Peter comes in; notice that Sigourney Weavers' left hand is still at the top of the doorframe, in the reverse shot it's suddenly down. (00:56:10)

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Audio problem: Running away from the 'bear', Tully shouts the humorous line; "I'm gonna to bring this up at the next tenants' meeting...there's not supposed to be any pets in the building." However, look at Rick Moranis' face; his lips are not moving and the line was dubbed over. (00:54:10)

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Continuity mistake: When Dana struggles with the literal arm-chair, one of the arms pops out of the top of the right armrest and a clawed hand clutches Sigourney Weaver's face. Change of camera angle, and not only she is struggling against the demonic limb in a different position, but the hole is gone from the top of the armrest, the arm is sticking from the side. (00:51:45)

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Continuity mistake: Dana gets home and puts down on the table the paper bag with food and her coat as she answers the phone. She takes her shoes and pants off and the camera cuts away to a different angle where the coat and the paper bag have changed position. (00:51:00)

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Factual error: Thanks to Poirot's aggressive bargain, Dr. King pays the butterfly pin 5 dinars. We're in 1937 Jerusalem, but she's using to pay a modern (contemporary to the day of the shooting) 5 Jordan dinars bill, in a country that at the time had the Palestine pound as currency anyway. (00:50:00)

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Continuity mistake: Poirot is in colonel Carbury's office to convince him not to rule the death as natural. He tells Carbury that he will tell him who the culprit is. Carbury is holding his glass with both hands, but in the next shot as he asks "Well, how long will it take?" the glass is in his right hand since the left hand is busy supporting him against the chair. (00:48:50)

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Continuity mistake: Poirot asks Sarah King if the bottle of digitalis in her bag was empty. In the wide angle his index finger is placed on the neck of the bottle, it's much lower in the close-up. (00:47:30)

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Revealing mistake: When Dr. King checks on Mrs. Boynton, the dead woman opens her eyes by her own volition before her head rolls back. (00:45:00)

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Continuity mistake: After 'behaving like a man' kissing without consent, Raymond says bye to Sarah; he says "There's something I have to say, and do, to prove you that..." The shadow cast on her chest changes as the camera angles change, on and off her necklace. (00:43:10)

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Continuity mistake: When Raymond invites Dr. King at the postprandial trek, his hand is right next a large crease on the towel, completely ironed out when the angle changes. (00:41:30)

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Continuity mistake: Poirot waves goodbye from Carbury's car as they leave for a tour of Acre. Sarah King waves back. Behind her in the background David Soul is at his own table, sitting staring ahead. Cut to Emily suggesting everyone to go for a walk; Soul is standing, wearing his hat already and facing the other direction. And it's a shot supposedly in continuity, because the same extra is walking outside the tent in both. (00:40:00)

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