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During the opening overture, right when the orchestra starts "Maria", you can hear someone sneeze in the background. It's easier to hear on the soundtrack but you still can hear it in the movie.
When Miller throws explosive into the German patrol boat's engine room it explodes in sheets of flame, etc. However, there is no damage at all to the fishing boat - no scorch marks and no debris. At least the sail should have caught fire.
There's a scene in one of the camp cabins where the two girls are talking. It cuts away from one girl, and she has an ice cream cone in her hand, then cuts back and it's gone. This keeps happening.
Near the end of the movie, when George Peppard is talking to Audrey Hepburn in the alley and it's raining heavily, his hair switches between being combed back and combed to the side. Very obvious - this takes place several times.
During the initial dive the hydroplane on the sail (conning tower) is pointing upwards. During a later dive the hydroplane is pointing downwards. Wouldn't one position cause the submarine to surface?
When Sam Twist jumps from the train on the Forth Bridge, he lands in a puddle between the tracks, which are resting on sleepers on top of ballast - but when we see the train disappearing, there are no sleepers or ballast - the rails look like they're on concrete 'runners'.
During the scene when Cliff's girlfriend is walking down a street singing, if you look carefully there is a gap between two of the buildings through which you can see the scaffolding holding the set up.
When the two men are carrying water up to their new cave home (via a home made elevator), one of the men is holding two buckets of water. In the shot where you can see the sea behind them, this man hands the second man a bucket of water, which he takes. In the very next shot, from inside the cave, the first man has both buckets and again hands the other man the bucket of water.
The shots are badly mismatched when Demetrius saves the elderly slave about to fall from the rope. Their arms and legs shift positions multiple times between takes.
The movie is set in 1843-44, when the rest of the world is still using cap and ball weapons, yet Ranger captain Jake Cutter is wielding a gunbelt with filled cartridge loops and a colt six-gun.
At the end of the film, Mary Magdalene approaches Jesus just as he has arisen from his tomb, at first shocked that he has arisen. As Jesus is talking to her and motioning with his hands, it is plainly clear that he has no nail marks/stigmata, when he should have. (See John 20: 24-29, where-in the resurrected Jesus shows "Doubting Thomas" the nail prints in his hands.)
At the opening of the film as the pirate ship passes left to right the flags are blowing in the opposite direction of the ship's movement and the sails keep blowing back although the ship keeps moving forward. Notice the large amount of churning water at the ship's rudder indicating that the boat is powered by a motor.
During several of the driving sequences, the teenager in the driver's seat turns the steering wheel - but the rear screen projection keeps the car "moving" in a straight line. And it's particularly ironic in light of the movie's "big message" that the students here bear no resemblance to real-life teenagers in any real school. They're all slim, trim, athletic and model-gorgeous, as well as all-too-obviously not teenagers at all. (Because US child labor laws severely restrict the hours that underage actors can work, many films "cheat" by having youthful 20-somethings play the teens.)