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In the final scene, pieces of Madeleine's hair-do come down in the struggle up the bell tower steps. At the top of the tower, before she falls, her hair is in perfect shape again.
When Kirk Douglas returns in the viking ship to his home fjord, many vehicles can be seen on the road through the trees on the other side of the water. Vauxhall Vikings perhaps?
In the last scene of the chess game, you can see that both the Knight and Death have castled. Castling was introduced to the game of chess in the 16th century, well after the film is set.
After Maggie (Liz Taylor) goes outside to confront Brick at the car during a raging rainstorm getting thoroughly soaked, she appears a short time later in the drawing room in the same dress, immaculate hairstyle and makeup, looking like she hadn't seen a single drop of water.
Every time we see the Nurka fire a torpedo, regardless of whether the order was "fire one," "fire two," or even "fire five" or "fire six," the torpedo is always seen leaving exactly the same tube.
When McKay and Ramon are riding into Blanco Canyon to rescue Julie, you can see a diesel loading shovel with its bucket raised in the bottom of the frame of one of the scenic shots. Presumably the scene was shot in a quarry and they didn't get all the equipment out.
Both sides (American & German) use the same tanks! The American tanks have white stars painted on them, while the German tanks bear white Maltese Crosses.
In the final sequence where Dracula's foot has been disintegrated by the rays of the sun, his foot is seen firmly attached again seconds later as Van Helsing confronts him with a makeshift cross. In the scene Cushing, with his back to the camera, steps forward quickly from the foreground to cover the area where Lee's foot is briefly seen as having not been disintegrated.
When the aliens blast off at the end of the film, the bright light causes the shadows of the actors & vehicles, etc, to appear on the painted backdrop of desert & sky.
When a lifeboat is floating upside down, and people are trying to climb onto it, it is not bobbing from side to side at all, as if it was fixed to the bottom of the water.
During training when the men are running and the two British come out of the bushes and shoot at the ground, there are 3 rows of bullets going past and only 2 guns being fired.
In the beginning of the movie (about 10 mins. in) Steve McQueen and Aneta Corsaut are driving along and think they hit an old man on the road. They stop the car and get out. There is a shot of the rear right panel of the car, two sets of "lights" are visible reflecting off the car. One single light and 4 lights in a square shape to the right of it. They help the man into their car and there is another side shot of the car and the lights are now 3 sets of 2 lights. They're in the middle of nowhere, at night, along a country road. It looks like "light trees" used to illuminate a scene at night.
As the stagecoach rolls into Prescott, Arizona, the road winds among hundreds of Saguaro cacti. Prescott is far beyond the northern limits of the Saguaro.
The interior of the ship is quite spacious, a central atrium on each level, with crew quarters and storage spaces opening off it. Yet, when the two officers take a space-walk down the length of the ship, it appears to have a diameter of less than 20 feet.
When Gaston is not allowed to take Gigi out for tea, Madame Alvarez tells him to sit down. As he is seating himself, he unbuttons his jacket. A moment later, he stands up and unbuttons his jacket again.