Continuity mistake: The arc-shaped garden plant directed the protagonist to someone who can help him. A nasty human armed with shears walks by and starts his torture; he kneels by the plant, in a zone with no shadows, and in the next shot the whole section of ground is in the shade. (00:39:40)
Factual error: When the protagonists arrive to Patmos, latitude and longitude are switched the other way around at 26°489 and 37°411. Moreover, that's not Patmos, but Anydro Patmou, an uninhabited islet unlike what is shown here.
Continuity mistake: When Chiyoko places the blue book as she is moving books around, a part of the pages of a brown one goes from white to brown and back to white.