Continuity: When Edward first meets Sister Willow in the woods on the island, he makes a motion to close his sports coat. In the next shot of him, his sports coat is completely buttoned. In the ensuing shot of him after a quick shot to Sister Willow, Edward's coat is completely unbuttoned and open again.
Factual errors: The shells Willow drops on the ground appear to be .45ACP rounds, which are significantly larger than the 9mm rounds Edward's Beretta pistol would fire.
Continuity: When Edward and Willow meet near the remnants of the old stone building, he is clearly shown not wearing his sidearm as he stands near an open window; when he and Willow return to her daughter's room he is wearing his sidearm. There were other instances of the on again-off again sidearm, but that is the most obvious.
Continuity: Edward is soaking wet when trapped in the crypt. When Willow rescues him and they climb out, he appears to be completely dry.
Revealing mistakes: There are clear car tracks on all the dirt roads around the island but the people in the movie who live there only walk or cycle.
Crew or equipment visible: In the beginning when Nicolas Cage's character is staring at a truck as it drives by you can clearly see a crew member in the reflection of the truck as it speeds by.
Continuity: When Officer Edward Malus pursues the station wagon, he has his emergency lights on the motorcycle flashing. But, when he pulls the bike behind the pulled over station wagon (a distant camera shot) the lights are not on. However, when the scene goes to a close up of Edward dismounting the bike, all emergency light are flashing again.
Continuity: Officer Malus picks up dirt off of "Rowan's" grave twice.
Continuity: Willow's hair switches back, and forth, between a single part in her hair to a double, somewhat braided, part in her hair.
Continuity: When Edward is attempting to rescue Rowan, he is wearing the bear suit. He first unveils a mesh cover below the bears nose to reveal himself to Willow then replaces the mesh to protect his identity. At the point where he goes to rescue Rowan, he is clearly seen wearing make up instead of the mesh. Then, after removing the bear suit... there is no make up.
Continuity: After swimming to the Sea Plane, in his boxer short's and t-shirt, Edward swims back to the dock where he is next seen fully dressed and totally dry, except for his hair. Then, while walking up the lane, there is absolutely no water bleeding through to the outer clothing from the soaked undies beneath. Evidence to him having these on underneath is that he is wearing the same boxer's / t-shirt combo after the bee attack when he is dressing after his recovery.
Continuity: When Officer Malus writes the name "Rowan Woodward" on the school blackboard, the first "W" in "Woodward" is above the line he draws under the name. In subsequent shots the "W" is through the line.
Continuity: When Malus first lands on the island his hair is mussed and he is very sweaty. The next instant his hair is neatly combed and he has a fresh makeup job.
Revealing mistakes: When Edward is drinking the tankard of mead, we see his face through the glass bottom. A few moments later, he smashes a bee with it. In spun metal tankards of that type, the glass bottom is recessed to protect the glass. He could have trapped the bee, but not smashed it except with the bottom rim, which is too narrow to make such an action plausible.