Factual error: The imprisoned Count is crawling through a tunnel with his neighbour prisoner leading the way. His neighbour prisoner has a lit candle showing the way, but when he breathes out, the candle goes out but the 'light' remains. You can clearly see smoke rising from the candle before the scene cuts away.
Visible crew/equipment: Very near the end, when they are doing a pan-out of the deserted building, there are three of the five characters standing in plain view. The other two are in the building, one is helping the other cope with a wound. When they do the pan-out, look through the bottom right "window hole." There is someone standing there, and it can't be any of the five people mentioned.
Continuity mistake: In the scene where Mercedes confronts Edmond for the second time and he finally admits who he is, she makes a point of showing him the string still tied to her ring finger. Two scenes later, it is also visible when she is still asleep in bed. However, in the scene after she has been shot and everyone is tending to her, her left hand is shown several times and there is no string. Considering her statement that it would, "never leave my finger," and her later reiteration of that in addition to, "and it never has," for the 16 years she was separated from Edmond, it is strange that it has suddenly disappeared.
Factual error: Napoleon continually addresses the British officer on Elba as 'Lieutenant' Graypool despite his displayed sergeant's stripes. Napoleon is a professional soldier who has fought the British and lived with them for some time - he is unlikely to be confused by British rank insignia.
Continuity mistake: When Edmond goes to Fernand for help, they end up fighting in something similar to the living room (it's quite a big room). After the police take Edmond away, he throws his sword, but it hits the fake wall that is supposed to be the living room behind him and it's easy enough to tell that the room behind him is not real.
Factual error: During the opening credits, Fernand Mondego is tipping back a bottle of booze on the rowboat. The bottle is quite out of place for 1814, as it shows modern "makers marks" on the bottom. Glass bottles during the French Revolution would not have had these markings; they did not start appearing on glass bottles before the middle of the 19Th century.
Continuity mistake: Edmond Dantes has just spent several years digging a tunnel through the rock walls of Chateau d'If. Yet when he washes up on the beach, a close-up of his hand shows us perfectly clean, manicured fingernails. Salt water may wash your hands clean, but it certainly won't trim, file and repair broken fingernails for you.
Other mistake: In the dancing scene that takes place toward the end of the film at the home of Fern and Mercedes . When the Count of Monte Cristo asked Mercedes to dance with him, there is a close up of Mercedes' face where you can see that she is wearing contact lenses. There a few more scenes with her where it is very noticeable.
Other mistake: In the first scene at Marseilles, the shipping company's sign reads "Morell & Co. Shipping", but the owner's name is spelled "Morrel". French spelling didn't vary at the time, since the French Academy had by then been in place for some 200 years. And even if a businessman might not spell everything correctly every time, he would at least know how to spell his own name right and would make sure it is so on such a commercial sign.
Continuity mistake: When Edmond Dantes is being swung back and forth to be thrown over the cliff the seams of the body bag are on top. However they show him looking through the seam as the bag is swinging as if the seam is on the side. He would have only possibly been able to see at the furthest point away from the keys yet the view of the keys is clear as the bag is swinging closest to the keys. On top of this the angle of the view of the keys would mean his head would have to be in the middle of the bag to be lined up with the keys. In the next shot his hand is lined up with the keys.