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During the "How Long Has This Been Going On" number, Hepburn dances by a mirror - reflected in it are the camera crew, desperately trying to get out of the image.
In the scene where Kirk Douglas 'appears' to pull a knife from his collar and throw it into Lee Van Cleef's chest, you can see Kirk Douglas pick the knife up from a trough in the front edge of the bar. The knife is already in his hand when he reaches to pull the knife from his collar.
In the scene where Henry Fonda is recreating the testimony of the old man getting out of bed & walking down a hall, you can clearly see a shadow of the camera on the floor.
When William Holden visits the Special Operations HQ for the first time a black vehicle is seen pulling in to the complex. The car is a 1948 Dodge or other Chrysler product which had not yet been manufactured.
When Katharine Hepburn carries the white carnations out of the elevator (which have just been given to her by Gig Young), they turn pink when she steps off the elevator and walks outside.
at the beginning of the movie Mr. Coates tells his wife that he will be gone "All of three months , maybe four". the first time we see Bud and Elizabeth Searcy she tells Travis that her dog is pregnant and that Old Yeller is the father we then see her dog (who does not look very pregnant)and the next time we see Elizabeth she presents Travis with one of the pups the problem is that the pup that was supposedly just born is about 4 months old.
When the group go out to inspect the house damaged by the monoliths, the dirt around the rocks is white while the rest is dark. The professor squats down and picks up white dirt in his left hand and dark dirt in his right hand, then calls the geologist. In a close up, he opens his hands and the dirt colors have changed hands - the shot has been reversed.
Allison is wounded by a grenade fragment while disabling the Japanese 105's. But when his bloody shoulder is first seen, the blood stain is visibly too bright for real blood.
In the film the scientists are discussing the growth rate at which Lt. Col. Glenn Manning is experiencing. The scientists explain that the heart is made up of just one cell, but this is not correct.
If Ashley kisses somebody, her good luck is passed on to them. However, Ashley kisses Chris Hemmington before she kisses Jake, so shouldn't Chris Hemmington have her luck?
At the start of the film when Tom is doing his trial run, he is forced off the road to avoid crashing into two oncoming trucks, driven by Johnny and Red. His truck has the number thirteen number board on the front, which isn't on it during any other time during the trial run, although it's on the truck for the rest of the film.
When the UBoat changes course, Andrews, operating the radar repeater, is immediately able to provide the bridge with the target's new course and speed. This would be impossible without extensive calculations and at least range and bearing plots once the target has steadied up on the new course, either figured on the scope screen or on a maneuvering board. One must remember that both vessels' courses and speeds must be taken into account when making computations, and the relative direction of a target's travel most often is not its true course.