North by Northwest (1959)

Revealing: In the shooting scene in the Mount Rushmore cafe, a boy in the background puts his fingers in his ears, because he knows the gun is about to be shot.

Continuity: When in James Mason's house in South Dakota, Cary Grant writes a message to Eva Marie Saint on a matchbook from which several matches are missing. When Ms. Saint subsequently reads the message the matchbook is full.

Other: When the plane hits the gas truck and it catches on fire, instead of getting out on the passenger side, the passenger crawls out the driver's side.

In the scene when Cary Grant is going up the steps to the UN, Alfred Hitchcock shot it from a rug truck across the street. He wasn't allowed to shoot the front of the UN. If you look closly, you can see a security guard in the left corner.

Cary Grant was born on January 18th, 1904, and the actress playing his mother, Jessie Royce Landis, was born on November 25th, 1896, making her just seven years older than Cary. According to commentary on the DVD, it was thought that casting Landis as Cary Grant's mother would make Cary look young enough to be a believable love interest for Eva Marie Saint.

After Eva Marie Saint snatches the sculpture containing the microfilm from James Mason, Cary Grant remarks, "I see you got the pumpkin." This was evidently a reference to the Alger Hiss case, in which Whitaker Chambers testified that Hiss had given him government secrets that had been hidden in a scooped out pumpkin in a pumpkin patch in Hiss' back yard.