Cars are mentioned often as presently existing. If there's enough metal to build cars, how is there not enough for steel boats? And why is it that technology mentioned contrasts so badly with technology seen?
There are no ranged in the series, even though crossbows at least, and more likely pistols, should coexist with the pirate's level of technology. Especially since automobiles are present.
Squick: Sidorio magically impregnating the twins' mother.
They Wasted a Perfectly Good Character: Narcisos Drakoulis is introduced as a powerful antagonist with some interestingly twisted motivations, but he then disappears from the narrative and is only mentioned later to be killed off-screen and in a Out-of-Character Moment of pleading pathetically for his life. Many think the character, to put it simply, could have been used better.