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When Marion is driving her car through the night, she keeps looking at her speedometer. You can clearly see that the gear shift lever is in "park" as she is driving.
Here's a big historical mistake. The character of German Admiral Lütjens is depicted overall in this film as a wild-eyed Nazi fanatic. In real life, he was distinctly anti-Nazi, vehemently protested the anti-Semitic actions of Hitler's regime, and was himself subject to intense Nazi scrutiny as he was a quarter Jewish and his wife was half Jewish. He was one of many German naval officers who fought only for their country, not Hitler.
In the final fight scene between John Wayne and the bad guy, Wayne gets struck in the head, and as he falls backwards over the wagon tongue his toupee lifts off.
When Bowie and his men first enter the Alamo, Travis calls for the colors ceremony and the detail marches to the flagpole. One section is ordered to "halt", then the order "about face" is given. However, the detail does a "right face" instead.
McQueen and Brynner take a hearse up the hill to deliver a coffin to the graveyard. When they go back down the hill, you can see a plume fall off one of the horses' heads, but in the next shot, the plume is back on.
Jack Lemmon cooks spaghetti for Xmas dinner. On New Years Eve he picks up the tennis racket, through which he had poured the spaghetti, and one piece hangs limp from the racket. It would of course, have long dried and be hard as before cooking.
During the campfire scene a Morlock attacks Weena, and drags her off. If you look at the top of the frame, as the Morlock drags her away, the stunt man's head can be seen, as he forgot to wear the head part of the costume.
At the end, Professor Challenger misidentifies the dinosaur in the boiling water as a T-Rex. Its arms are too long, and it sports horns. It is much more likely a carnotaur. This area being a forte of his, I doubt Professer Challenger would make this mistake.
When Dean Martin desribes his writer's block to Judy Holiday, he says that he keeps sharpening his Ticonderoga pencil until there's nothing left but the "Ti," but in fact what would be left on a little nib is the "ga."
Seymour watches in horror as the wino is run over by the train. In the long shots, Seymour's hands are waving up and down at his sides. In closer shots, however, he's holding his hands up to his face and screaming.
Before Pollyanna arrives on the train, when Jimmy Bean pushes the metal hoop down the road, two girls stop their doll carriages right beside each other and grab their dolls. Next shot, their carriages are about 4 ft. apart – wide enough for Jimmy to run between.
When Cary Grant tells Deborah Kerr to keep the door closed, she is holding a record album. As a reaction to his directive, she lowers the LP to about waist level. The camera shot changes and she's holding the LP higher again.
When Henderson and his wife are walking on the upper deck before jumping off, you can not see any of the superstructure above them that should be visible.
Anita Ekberg's character and Marcello are at the top of the church tower leaning on balcony railing while looking over the city. You can easily see the "wire" attached to Anita's hat that forecasts the moment where her hat blows off her head.
Midway through when Ian Carmichael and his girlfriend are dining at a restaurant with Terry Thomas, they are talking and looking at the menu. The table is laid with cutlery and wine glasses - ready to eat. During their conversation there is a shot of Ian Carmichael only talking and smoking but there is no cutlery and the wine glasses have been replaced by a brandy snifter, obviously after the meal. The next shot shows the whole table with the correct pre-meal setting. When they have finished the meal, the table setting is as it was in the earlier shot.
When the Jeep at the head of the army convoy starts off again, after being stopped at the temporary traffic lights set up by the crooks, the external shots show the Jeep passing the traffic lights. But the next shots from inside the Jeep show them passing the traffic lights a second time.
In the scene where nickels fall on newspapers announcing that Roosevelt beat Hoover, at least one of them appears to be a Jefferson. The election occurred in 1932. The first Jefferson nickel was minted in 1938.
In the scene when Lulu Bains is prancing around in the dressing room, there is one steady shot of her. In this shot, as she moves around, the right strap on her outfit begins to slip off her shoulder. The shot ends by her side with the strap completely down her mid-bicep; however, in the very next shot, which is from the front, her right strap is back up, and it's her left strap which is halfway down. The print wasn't reversed to this effect, either.