Plot hole: While planting the suicide gear in the bathroom before Buckley comes in, Cooper tells Josh to tie the rope into a noose as they go to hide in the shower. Josh replies that he doesn't even know how to tie a noose. He must be a quick study, because in the 45 seconds or so that it would have taken Buckley to relieve himself and wash his hands, Josh has tied a perfect noose.
Continuity mistake: When Josh and Cooper break into the Mental Health Facility, we see the entire pane of glass broken out and falling towards the camera. In the next shot, we still hear Cooper breaking away glass, and when Josh flips the window up, broken glass still remains in the frame, even though the whole pane was gone.