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Just before the giant tarantula attacks the house where heroine Mara Corday is studying, you can see several book on the library table at the big picture window. The largest book on the table keeps shifting positions in several scenes.
Lady is put in her bed and the master leaves the kitchen but he goes back in and puts a newspaper on the floor and leaves again but Lady gets out of her bed so the master comes back once more and puts her back in her bed but the newspaper on the floor has vanished.
The scene where the people are going to Skidmore for the box social, Laurie greets several young ladies on the front porch, they hear Gertie laugh and you can see the same young ladies just getting out of wagons and surries.
Adelaide performs her first number and finds Nathan in her dressing room. There is a pink robe draped over the partition. Placement of this robe changes during the scene without being touched.
During the robbery, the taxi driven by Danny Green changes from an Austin to a Morris Oxford and back again. Both types are the same colour, but the Austin is the one with the rounded radiator grille, and the Oxford has a flat radiator.
Keep an eye on the letter that Cary Grant has with all of the names of the potential theft victims. 1) The way it is folded changes from 3 folds to 2 and from up to sideways. 2) The suite numbers are wrong , as seen when CG goes to Grace Kelly's, and it is different from the list.
At the beginning of the movie at the police station and the next morning at breakfast, it at least appears to be established that Grandma lives with Jim and his parents. After all, they had just moved from another city and Grandma was there early in the morning at breakfast time. However that's the last we see of her. She is never mentioned again nor is she there after Jim comes home from school or at anytime after the trouble starts. It would be unusual for someone to sleep through all that went on; but no one ever says anything about "being quite or we might wake Grandma up." After that scene at breakfast, she is forgotten.
During the desert chase sequence, when our hero is run off the road by Ernest B. his missing arm is momentarily transposed when he steps from the jeep.
A couple cross the road to enter Victoria Coach Station, London. There is the noise of a coach braking hard and they throw themselves away from a coach just inside the entrance, which obviously was not moving at the time. They walk into the station and talk to an inspector, while the same coach is driven out of the entrance past where it is supposedly parked.
When Jimmy Stewart is almost down to the runway during the bad weather, the aircraft exterior shots show the type of cloud tops found only at high altitude, not low to the ground.
Lobo has a very distinct scar on his cheek in the beginning and end of the movie. However, just after Dr. Strowski has entered the house, Lobo is seen coming down the stairs, and his scar is completely gone.
While the Confederate captain is explaining the mission, a couple of the "patriots" are inserting cartridges into their Colt Peacemakers. A neat trick, since the Civil War ended in 1865, and the Peacemaker wasn't introduced until 1873.
In order to make Polyphem drunk, Ulysses and his men produce 'wine' by treading on grapes. Only thing is: without fermenting the stuff for a few months, all you get is grape juice, which is not even remotely intoxicating.
In the scene where Leslie Howard and Jose Ferrer are sharing what appears to be some port (about 50 minutes into the movie), the port decanter has a drip stopper in the long shot which disappears in the close-up shot of Leslie Howard and then re-appears in the following longer shot.
When William Holden is visiting Frederick March in the Admiral's cabin a boom microphone is visible near the air conditioning ducting in the ceiling. A shadow is seen, then the microphone drops down into the shot. The microphone moves a bit and then is raised.
When the soldiers are ambushed by the Germans, they jump off and Jack Kelly is wounded in the arm, showing a torn shirt and bloody arm. Later when Audie Murphy is wounded and in the hospital Jack Kelly visits him. The only bandage on him is on his hand, which wasn't injured before.
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