Revelations - S1-E4
Continuity mistake: Frank is at the Japanese emperor's event, and he pulls out a single action revolver with the hammer already down, a few seconds later as he's about to raise the revolver, the hammer is somehow up, and he begins cocking the hammer to make the gun operational. (00:49:40 - 00:50:20)
Continuity mistake: The officer committing seppuku is seen drawing his blade, and the katana of his kaishakunin is still sheathed. He grunts as he is about to thrust his blade, and the kaishakunin is now holding his katana in the air, ready to behead the officer. When the officer thrusts his blade into his body, the kaishakunin has a sheathed katana again, just about to draw. (00:21:05)
Escalation - S2-E4
Continuity mistake: After Thomas pours Juliana and himself a glass of milk, the position of Juliana's glass moves without her touching it a few times between shots. The amount of milk in each glass also changes.
Escalation - S2-E4
Continuity mistake: When Juliana and Thomas are talking, Thomas pours them both a glass of milk. Throughout the scene, the amount of milk in each glass changes between shots.
Escalation - S2-E4
Continuity mistake: After Thomas pours Juliana and himself a glass of milk, the position of Juliana's glass moves without her touching it a few times between shots.
Continuity mistake: When Kido throws his son out of the house, he knocks over two candles sitting on a table. But mere seconds later, the two candles are back to their original positions.