Continuity mistake: When Epps first walks into Katie's cabin, there is a straw hat underneath a suitcase on top of the clothes rack. Yet when Epps gets up again after looking at the dress, the hat is now on top of the suitcase without her having moved it. (00:53:40)
Continuity mistake: When Munder goes through the floor, we get a shot from beneath seeing him dangling down the hole from his waist. But when it cuts, we see Epps reaching for Munder down the hole. The upper half of his body should be sticking up from the hole. (00:20:30)
Factual error: The wire which cuts the dancing characters in half severs their torsos in a neat line a few inches below their armpits - but their arms remain intact. They should have been severed too, a few inches below the shoulder, and should fall away from their bodies separately.
Other mistake: Ferriman says he can only mark someone if they do something sinful first. Dodge shouldn't have been marked as he technically shot Ferriman in self-defense, which isn't considered a sin, but near the end Epps sees her dead crewmates and Dodge is also shown as well as marked.
Plot hole: After the tugboat is sunk, the crew try to repair a very old ocean liner - the ghost ship - using equipment that could only have come from the tugboat, which had the latest scuba gear and welding gear, but they are all at the bottom of the ocean in the blown-up tugboat.
Factual error: When Murphy goes into the "Cabina de Capitano" (Captain's Cabin), he sees the glass with a little alcohol in it, and the bottle standing next to it, without a cork or stopper. If left standing open like that, after 40 years, the liquid would have evaporated. However, it can be said that the Captain's ghost made it appear to entice Murphy.