When Sir James and Peter are watching Alice's grave, they have to leave to help the vicar who has been attacked. The squire and his men open the grave and reveal Alice's corpse but are disturbed when Sir James and Peter return. As the two watch she transforms into a zombie and crawls out of her grave. But when they arrived back in the cemetery and found the open grave we see Alice for an instant in her coffin and she is already in zombie make up, even though this is before the transformation.
After Squire Clive Hamilton catches Sylvia's blood in the glass, he transfers it to a vial. When he does so, it is revealed just how much blood was in the cup. However, there's no way that that much blood could have possibly come from a small wound on her finger.
Immediately after Denver is struck down during the struggle with Sir Forbes, he lands face down with his left arm inside the fireplace and his left arm catches on fire, but in the next shot he is facing up, and it's his right arm that is on fire.
In the waning moments of the film, a man can be seen whipping the zombies in the mines in order to get them to work faster. During several of his lashes, his whip strikes some of the beams supporting the mine and they wiggle dramatically. This indicates that the beams were not only incapable of supporting the mine, but were also not the sturdy wood they appear to be.