Continuity mistake: When 9 meets 3 and 4, they open his zipper. During this scene, several close-ups show 9 with the zipper closed and open again without anyone closing or opening it.
Continuity mistake: When 9 created the "torch" from a light bulb, it needed to be turned to work. However, when 3 and 4 investigate the bulb one of them simply puts it in and it starts glowing without being screwed.
Continuity mistake: During the funeral scene for 2, a tunnel with steel bars is seen in the background, with none of the bars broken. When the camera angle reverses once 2 has floated into the tunnel, one of the steel bars is broken.
Continuity mistake: When the Seamstress is sewing 1, he falls and the coin falls off his hat. However, in the full shot, 1's coin is back on his hat.