When Wren reveals to Edo Voss that she has sight by completing his jigsaw, the position for the final piece to be added to the puzzle changes between shots.
Lord Harlan says that they all have to spend night with their declared partners otherwise other side will notice and get suspicious and the peace talk will fall. He was convincing and Baba Voss and Maghra agreed to it. But at the same moment, Wren and Haniwa were spending night together and even though it might not be harmful for Haniwa if others come to know of, it will surely tell a lot about Wren and lead to revealing her role in escape of Baba Voss and Witchfinder general from Edo Voss' captivity. There seems to be a contradiction here.
Baba Voss hears the sounds of intruders at the peace camp and the dead of the night, and locates them and even shouts for everybody to wake up, even then there seems to be no activity at all at the entire camp from both the sides. Even before that, it seems odd that such a crucial summit had just two guards protecting entire camp who could be overpowered and killed in a second and the intruders could walk in and out of the camp killing whosoever they were instructed to kill.