Continuity mistake: When Snake and Wolf are fighting in the prison, a guard crashed down to the floor from above. Later, however, the guard is gone. (01:01:43 - 01:02:29)
Suggested correction: When this guard falls to the floor between Wolf and Snake, he points to Diane Foxington at the upper level. Then, in the many shots that follow, we do not actually see the floor area where Wolf and Snake are being held by their own two guards. While Diane is taking out a bunch of other guards in multiple shots, the guard who originally fell has had ample time and opportunity offscreen to simply flee - just hightail it out of there. So, as stated in the mistake, that guard is gone "later" in the scene, but this is not problematic to continuity.
That is a very legitimate correction. I do have one possible counter. When Diane was perched atop the railing, the ceiling above had additional lights above her, indicating it was the top floor/level. When Diane jumps high when the lights turn red, you can count the number of floors. There are three floors above the ground level. If that's the case, I personally feel it would have been very hard for the guard to move at all, let alone flee.