@mechajutaro said:

I seem to recall a scene in the interrogation room where Celia's cop friend plays footage of the murder. Somehow. he didn't notice the knife floating across the screen and into her hand. as if carried and planted there by...well, an invisible man

I don't remember this scene? I literally just watched it... He does play her CCTV footage of her running down the street like a crazy person though

Pretty sure the psych ward corridor would have had cctv. Just too many plot holes in this movie to enjoy.