Continuity mistake: Hrundi is watching Bill Kelso and his lady friend playing pool. As he watches, note that all of the pool balls are in the corner of the table. Hrundi then talks to them and becomes friendly and gets Kelso's autograph. Then, during the scene suddenly all the pool balls have changes their position and they are now spread out instead of being in the corner. Nobody moved them and nobody shot the balls.
Continuity mistake: In the last scene of the movie Eleanor leaves by boat to go back to her castle prison. When we see Henry waving good-bye he is standing right next to a post when we see him from the back, but this post is nowhere when he is shown from the water. (02:08:10)
Continuity mistake: When Coogan first meets Julie in the New York police station and puts her coat on for her you can see his cigarette in his hand, then his mouth, then his hand again as the camera angle changes.
Revealing mistake: During the bank hold-up at the beginning of the film, one of the pushes a man on the wall. It wobbles like cardboard.
Visible crew/equipment: When Peter rolls up the car window upon arival at the Merry estate, crew members' reflections can be seen in the window.
Factual error: The German tanks are American M47s, post WW2. They had the same hulls as the M46s (also post-WW2), but a better slope and greater effective armor on the turrets.
Factual error: In the famous tugboat scene, Fannie rides out on a New York Central tugboat painted jade green - a color which wasn't instituted on the boats until the early 1960s. To be accurate, the tugboat would have to have been painted red with a black stack and the New York Central logo.
Continuity mistake: When Finian and Og are talking in the forest, Og is kneeling on a log. He leans over and falls into the river. You can see him completely submerged. He stands up and continues his conversation with Finian while standing in the river and his hair is now completely dry.
Continuity mistake: Many times, especially in the second half of the movie, the background color changes between shots even in two shots of the same set.
Revealing mistake: When Carole and Jim rush out of Herbie to find Thorndyke under the bonnet, you can see that Carole is not Michele Lee but her stunt double.
Continuity mistake: Joe Bass, freshly robbed by the Indians, is asking the slave "You come a long way from home, you ran away?" In his hand is a bottle of liquor with the cork on. Change shot, the bottle is open. New change, and now the bottle is closed again. (00:08:00)
Factual error: The film tells the stories of five male/female couples. They have conflicting aims in their relationships. For example, one wants to become a parent while the other does not want children. Thus they all obtain supplies of contraceptive pills (in bottles) and re-label them as aspirins or vitamin tablets (or vice versa) depending on whether they want pregnancy or not. The bottles get mixed up, causing panic and anxiety for all involved. All the interlocked stories are based on a complete error. Contraceptive pills are not stored in bottles. Contraceptive pills are packaged in 'blister packs'. This basic fact makes a nonsense of the entire film.
Revealing mistake: When the historic "Mahna Mahna" sequence in the sauna ends, the girls come out of the building running through falling snow in all their youthful bounciness. The "snow" comes from the left, at a rather extreme angle; if it were real snow there would be an awful icy wind blowing, but the girls' hair is mostly unperturbed, and in the shots that follow there's no snow at all. It's obvious that this snow is just coming from a fan kept off frame. (00:51:15)
Revealing mistake: At the beginning of the opening title sequence if you look behind Silence as he rides through the snow covered forest you can see what looks like a couple of skiers whizz by. (00:05:34)
Continuity mistake: When Gregor and Willie are attacked by the German convoy, they pick up two discarded StG 44s, but in th next scene they are firing AK-47s which had not yet been invented. After the battle, they are again carrying StG 44s.
Factual error: When Premier Kamenev shows Kiril a map over the Chinese-Soviet border, it shows the Korean peninsula as a part of China.
Revealing mistake: When Buck and the gang ride away from the saloon in Dallas where JC made a few new 'friends', the footage is sped-up for a second just as soon as James Caan jumps on his horse. (00:05:50)
Continuity mistake: Throughout the movie, Alan Arkin is carrying in his breast pocket a Cross Chrome pen to write messages with on his pad. (He is a deaf mute.) But in the scene where he is on the porch with Sondra Locke and he is drawing a picture for her, he pulls that pen out of his pocket, yet when the scene cuts to a different angle showing him actually drawing on his pad, it is a thick, black felt tip pen. (01:25:00)
Factual error: First time I ever saw a 600 mile NASCAR race where nobody had to make a tire change.
Continuity mistake: The girl named Why is in the bathtub. Frédérique brought her a cup of tea that she indignantly put aside because it had an excess 1/2 sugarcube. She put the cup to the edge of the tub with the spoon facing one direction, but during the conversation the spoon turns 180° on its own during a cut. (00:07:40)