Continuity mistake: In the shower scene the shower is turned off but you can still hear it running. Then it switches back on. You can see it off and on during same scene but the sound is always running. (00:50:00)
Suggested correction: There are numerous times that the shower is running. When you can hear water but not see it, you're looking at a different shower pole, or it's because the grey shower pole behind the stream makes it hard to see. Look at the ground and you can see the water's impact.
Revealing mistake: After Bennett takes off, Luther jumps on the edge of the prison. When he hits it, you can see the seemingly solid concrete edge wobble.
Continuity mistake: When Alice is shining her flashlight into the tunnel, note that the shower column is on the right side of the tunnel entrance. In the shots on the outside of the tunnel, that same column is on the left side of the entrance. (01:04:30)
Suggested correction: From the shot in the tunnel, the shower column is on the screen right. When we see the group stood around the hole, the column is still on the right side.