Sacha

Continuity mistake: While drinking in the train Thornhill's hand is grabbing the glass or not, depending on the shot. The position of the glass to his face also changes.

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Continuity mistake: When Thornhill is about to be run over by the truck his jacket is covered in dust. When he falls on the ground it's spotless, only to appear dirty a shot later.

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Revealing mistake: When Thornhill's cab arrives at the UN there's a couple behind him, a rear projection. Later on, when Valerian's car arrives at the UN the same projection is used, with the couple a mere two meters away form where they were before.

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Continuity mistake: When the truck is about to run Thornhill over, skidmarks running along the road appear/disappear randomly between shots.

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Continuity mistake: When the plane crashes against the truck its wipers face the left side. A shot later they are facing the right side.

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Continuity mistake: When the opening credits roll-in stating that the events are fictitious, there is a shot of a woman in blue exiting a building. When the credits end after Hitchcock's cameo, the same shot is re-used though this time from a couple of seconds earlier.

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Visible crew/equipment: When Thornhill exits the phone booth 6 stage lights are reflected on the glass door.

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Continuity mistake: When Thornhill is served a Martini in the train, check the toothpick and you'll see it keeps moving around between shots.

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Other mistake: At the train station, the same red-haired woman in a green dress with two distinctive suitcases appears three times in different places despite her walking the opposite way. Sometimes she has a hat and others not.

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Continuity mistake: When Thornhill makes a call at the train station the cord of the phone is curled in the wide angle but straight in the close-up.

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Continuity mistake: When the CIA meets, the paper next to the professor changes positions between shots and a matchbox appears and disappears randomly.

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Continuity mistake: When Thornhill is at the Plaza with his friends, a man grabs a drink and takes a sip while he places his left hand on the table. A shot later the glass is on the table and his left hand not.

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Continuity mistake: Amount of people walking on the street changes drastically between the moment Thornhill is in the cab with his secretary to when he gets out.

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Visible crew/equipment: When the crop duster and the truck are about to explode and the truck drivers run away, one can tell it's not Cary Grant watching the havoc but his stunt double because of his rounder face and slightly different hairstyle. Also confirmed by actress Eve Saint-Marie.

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Continuity mistake: When Thornhill watches the road from the crop field, the way he holds the crop and how the leaves bend, differ between the front and back shots. Also, his hands disappear and the leaves swap between dry and green.

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Continuity mistake: At the field, the first time Thornhill throws himself on the floor there's just a road with gravel. When he stands up there's suddenly hay everywhere.

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