Visible crew/equipment: Alex finishes talking to his wife, looks outside, and in the fan you can see the face of one of the crew members.
Audio problem: On the boat, Chaco comes up to DeJesus and asks what's up. When DeJesus answers in Spanish, what he says and his lips are unsynchronized. (00:15:00)
Continuity mistake: At the end in Sona, Michael is walking down a corridor. He gets over halfway and spots a lad in a red top having taken drugs. After this we see Michael again and he's back at the start of the corridor. Note the door on screen left and the number of light fittings. (00:40:30)
Answer: Don Self actually worked with Whistler before he died. And Whistler with the bird book actually knew where Scylla was.