Other mistake: After Finney got off the mattress, he was walking in the dark (at least a few steps). The screen went completely black, but Finney - who had not been in that basement before - was able to reach up and pull the cord to turn on the bathroom ceiling light. (00:29:50)
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Suggested correction: What the viewer sees and what Finney sees would be different; his eyes probably see low level light better than the camera. There would be a low level light going into the corridor from the room Finney was in. This would possibly be enough for him to see the light cord. We don't see the light cord, so we don't know how easy it was for Finney to see it.
