Continuity: When the plane crashes into the truck, the bystanders walking towards the scene have shadows, which change angles as you see the next shot. They took them both in the morning and the afternoon.

Continuity: While Roger and Eve converse before dinner on the train, Roger's glass mysteriously changes places several times.  When shot from behind, he's holding the glass; from the front, it's on the table.

Audio problem: Near the end of the movie when Cary Grant says, "Come along Mrs. Thornhill." If you read lips he's actually saying, "That's it." Submitted by ????

Continuity: When Cary Grant arrives at the hotel in Chicago, he sees Eva Marie Saint enter an elevator. By looking at the indicator light he sees that she has gotten off on the fourth floor. He would have had to have binoculars to see the elevator indicator light from where he was standing.

Continuity: At Prairie Stop 21, after the second man arrives, shots on Thornhill show that his left arm is bent (the sleeve is folded), but the wide shot on both of them shows his arms at his sides.

Audio problem: When Thornhill and Kendall reunite after the shooting, they are obviously on a soundstage and not on location in the wilderness. There is absolutely no background noise, which is impossible in the outdoors: leaves rustling, birds calling, water trickling, wind gusting, etc. prevent the complete silence depicted by the movie. The quality of the actors' voices also sounds like indoors rather than an open space.

Continuity: When Thornhill is talking to the maid in Kaplan's hotel room, right after she identifies him as Kaplan, his arm changes from bent over his stomach to straight at his side.

Continuity: Thornhill and his mother go to Kaplan's hotel room, room 796, to check the place out. There are two telephones in the room and both phones have old-fashioned non-coil cords connecting the phone and the handset. But when Thornhill rings the buzzer to summon the maid you can see that the phone suddenly has a more modern coil handset cord.

Factual error: The date shown on the newspaper after Cary Grant is accused of stabbing the diplomat at the U.N. is Nov. 25, 1958. The subsequent outdoor scenes clearly show leaves on the trees and people dressed for warmer weather.

Continuity: When Cary Grant writes a message on a matchbook and Eve Marie Saint reads it, the number of lines in the message changes. He writes 3 lines, she reads 4 lines.

Continuity: When Cary Grant's character, Roger Thornhill arrives at the UN building in search of George Kaplan we see his shadow fall onto the door of the cab, as if the sun is behind him. But when you look at the pedestrians on the sidewalk, their shadow falls in the opposite direction. Simple mistake to make when using 3 point lighting in a studio environment to produce a rear projection process shot.

Visible crew/equipment: When Cary Grant and his film-mother enter the elevator at the Plaza this is filmed through a glass-door and you can see the reflection of a crewmember in a white shirt who is crouching below or next to the camera.

Plot hole: Cary Grant arrives at the spies' house in Rapid City by taxi. Yet when he and Eva escape, they suddenly have a car at their disposal.

Audio problem: Before the famous attack by a crop spraying aircraft, Cary Grant is set down in the middle of nowhere from a Greyhound Scenicruiser. Another bus, a Flxible BR-29, also stops briefly. The soundtrack of the Scenicruiser's engine is re-used for the Flxible.

Continuity: Cary Grant, running through Grand Central Station after fleeing from the UN Building, has brown shoes, then black, then brown.

Continuity: His suit changes colour as he is running from the aeroplane. First blue, then brown, then back to blue.

Continuity: The top and back of Mount Rushmore looks nothing like they portray it in the final scenes of the film. This is a mountain, and they would need climbing equipment to get to the top of the mountain. Also there are no trees at the top, and the is a vault at the top of the mountain, behind the monuments. This vault was originally planned to be used as a museum, but Congress withdrew funding because of World War II, and the museum was never completed.

Factual error: Cary Grant steals a redcap's uniform while he was sleeping, implying that the redcap had been on the overnight run. Redcaps didn't ride the trains; they worked in the stations.

Continuity: When Eva Marie Saint is going out to the aeroplane near the end of the film, it is dark as they walk away from the house, but by the time they reach the plane it is suddenly daylight.