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Terry-Thomas's plane gets stuck between the carriages of a Paris-bound train (in fact filmed on the single-line track between Bedford and Hitchin). Just before the train plus plane goes into a tunnel you can see the cooling towers of Bedford's Goldington Power Station (circa 1960) behind TT's head.
In the scene where the Beatles are in bed sleeping, and Ringo is getting pulled out of bed by the ring, he falls out of bed, and brings the blankets with him. In the next shot however, the bed clothes are back on his bed.
In the scene in which Maria and the children are in a carriage singing Do-Re-Mi around Salzburg, at one point (when she is sitting facing the kids) she passes a shop that is painted in a very distinct color and with a distinct sign (it begins with an F: Frachts?), and a few seconds later, as she turns around to sit forward in the carriage, they pass the same store.
When James Bond is fighting underwater with an opponent, the opponent rips off James' diving mask (which is blue). Then James rips another mask off another opponent who is lying dead on the ocean floor. This dead opponent's mask is black. James puts on the black mask and then he turns around and the mask is blue again.
In the scene where Leslie is fighting the soldiers, one soldier hits a second soldier with his rifle. The rifle can be seen to bend around the soldier's body and then straighten again.
The daylight air-raid on the Norwegian Heavy Water plant in 1942 was done by Boeing B17G bombers, with the distinctive chin gun turrets. These planes did not come into service until 1944, when they were introduced to counter the head-on attacks by German fighters.
At the beginning of the film, you see Colonel Mortimer traveling on a train while reading a bible. He has a Indian squaw and a gentleman wearing glasses and a derby sitting across from him. A conductor comes by to pick up their tickets. Colonel Mortimer asks the conductor, "is it far to Tucamcari?" The conductor replies, "we pass there in three to four minutes." The gentleman with glasses starts to tell the Colonel that he is on the wrong train. As he tells him this, look out the train window and see a car driving off into the distance.
In the gunfight in Hasting's store, John Elder fires his six-shooting Colt to a total of thirteen or fourteen times, without requiring - or doing any - reloading whatsoever.
In the scene where Ursula Andress confronts Marcello Mastroianni, he reaches into an ice bucket where you see a very small pistol (PPK). When he points it at her, it changes into (I think) a Colt 45. It then, in another angle changes again into (I think) a Mauser Parabellum... Mistakes can be made if filming covers many days on the same scene, but when the dialogue mentions how he can hide a tiny pistol in the ice bucket.....
Before the damaged plane is dismantled, in some shots the three propeller blades of the port side engine are a mixture of clockwise and anticlockwise type. (The twist along the length of the blade goes the opposite direction depending on the type).
Throughout the film the characters are often seen riding in M151 jeeps (horizontal grill slits) which were not in production until the Vietnam era. Odd because they did have a few correct era Willy's jeeps on the set, usually seen in the background
In the beginning of the film when Natalie Wood first gets in the limo, she is waving goodbye to her mother who is on the pavement. As the limo is driving away and Wood is leaning out the window waving, there is a lamp post behind her that is so close it looks like it might hit her. When the camera moves back to her mother you cannot see the lamp post.
In the scene where Doctor Zhivago comes home after that trolley ride in which he and Lara pass each other without notice, he enters a glass vestibule in the house. As he opens the glass door, you'll see the reflection of a man's face in it. The reflection bears a close resemblance to David Lean, the film's director.
The giant-sized teenagers show themselves at the garden party and start making threats about taking over the town. They then spend the night in the theatre, and the next day they decide to cut off all communications to and from the town. For some reason, not one of the party-goers, or the sheriff, decided to call someone during the night and tell the remarkable story about 30 feet tall teenagers seizing the power through force.
In the scene when Carole catches Ms. Lefavre in Michael's apartment, she (Ms. Lefavre) tries to cover by pretending to be Michael's maid. As she moves about, cleaning various items, she talks about all the work she has to do, etc., etc. However, throughout this entire sequence her mouth never moves or so much as opens.
When Angela Douglas is singing her song her lips aren't moving to the words with were recorded and played while she is moving her lips the best time to see this is when the song says "love......." and even though her lips have stopped moving the words are still going.
Harry Palmer uses the leather wrist restraints to lacerate his wrists - the pain enables him to resist being involuntarily hypnotised. The next time he is woken roughly by the guards for another hypnosis session, his wrists are unmarked.
In the scene at the end of the movie where Lee Marvin is running interference during the escape by shooting in the air, horses pulling a beer wagon get startled and run into the street where the wagon turns over.
At the beginning of the shot, when the horses begin to bolt, you can see the stuntman driving the wagon. He is sitting low behind the wooden front of the wagon (which has holes cut in it so he can see out).
Near the end of the film the eye creatures are seen coming out of the woods. When you watch the scene one of the people playing, an Eye creature is shown walking with nothing but the Eye creature head appliance, black clothes and sneakers.