Other mistake: About two-thirds of the way in, Robert Young re-visits the 'scene of the crime'. While climbing up the steep bank from the ravine, he reaches the top and, and in a very short shot (a few seconds), his shadow is cast upon the painted background scenery.
Continuity mistake: When Dr. Sawyer is giving Kris the exam, during the part where Kris is doing the physical coordination test, we see Kris from Sawyer's point of view, and Sawyer is drumming his fingers. When the shot switches to Kris's, he is fingering his eyebrow. When it switches back, fingers drumming. Finally, when it switches back again, his hands are neatly folded in front of him.
Revealing mistake: Cary Grant shows off his ice skating moves but you can tell it's a stunt double. The double is a bit shorter than Grant. Also in the same sequence, the two other skaters have noticeable doubles as well.
Continuity mistake: Pinkie sweeps all the glasses on top of the bar onto the floor, yet after he and his gang have gone we see broken glass on the bar top.
Continuity mistake: In the scene where we see two pilots in the cockpit of a aircraft, the co-pilot has a fake moustache. The top lip appears to be coloured black.
Revealing mistake: When Joan Crawford shoots van Heflin, he reacts as if he was shot before the shot is fired.
Plot hole: Early in the movie, when Joe Stefanos tells Mary, the owner of the luncheonette, that he found Jeff Bailey by passing by and seeing the name on the sign of the gas station, it makes no sense. He only knew him by the name Jeff Markham. Even if he was just lying to her, he uses the same explanation when he is alone talking to Jeff. We never know how he found him.
Suggested correction: He told Jeff that he saw him pumping gas at the station.
Continuity mistake: When the stunt person for character Mrs. Kraft rolls horizontally down the dune, the stunt person's head is pointed west, but the scene picks up with the character's head pointed east. (01:10:00 - 01:13:00)
Continuity mistake: In the scene towards the very end of the film when Sister Ruth goes to see Mr. Dean, she is wearing a great deal of lipstick - in fact, her make-up is indicative of her having left the religious order run by Sister Clodagh. She becomes hysterical and faints. When she wakes up she's no longer wearing any lipstick (no indeed any make-up at all).
Continuity mistake: In the scene where Jeb shoots Prentice, we see Prentice with his right hand covering the wound just below the right rib cage. When Jeb carries him inside, Prentice's right hand is now covering the left side rib cage. (01:05:55 - 01:06:35)
Continuity mistake: When Robert Taylor escapes from the asylum, and is driving the second car he steals, the car is shown at least once with windshield wipers pivoting from above the windshield, then shown with the wipers pivoting from below the windshield. Clearly, these are two different cars. I think the studio borrowed wiper footage from the scene in which he is driving the first stolen car, to use at moments in the scene in which he is driving in the second car.
Continuity mistake: Pearl is singing a song to mock her boss at the factory. She goes through the first lines about being too worn out "to play." With her feet on the work table, she puts her hand under her chin. In the background, a fellow seamstress is watching. In the next shot, her arms changed position, now crossed in contrast to the previous shot. (00:04:40)
Character mistake: Tenango is a destination/rendezvous town, but at the luncheon a character refers to it as Durango.