After Captain Seafield gets two daggers in his buttocks, they disappear and reappear at random throughout the rest of the film.
At 18 minutes, when the team meets Ashcroft, his eye patch is over his right eye. At 49 minutes it is over his left eye.
At 1:14, after Seafield gets shot by a harpoon, he pulls it out and his eyeball can be seen flying through the air. Yet the next shot shows it hanging from his face.
At 52 minutes, when Seafield is in the phantom ship (presumed deserted), it pulls into dock and several people can be seen moving around the ship's top deck.
At 1:14, when Sean Shaughnessy says 'Thank you for avenging me', his lips don't match the words spoken.