Who got to the blood and how?
This is a question that has no definite answers, but there is a trail of actual events and logic that brings about some strong speculations. The keys, which play a crucial role to the sabotaged blood scene, disappear from the action when Windows discovers the Bennings-Thing in mid-assimilation. He had gone to get the keys from Garry, came back, dropped them and ran out of the room. We don’t see the keys show up again until right before the scene with the sabotaged blood. Someone obviously found them, used them, and somehow got them inconspicuously back into the action. (A good guess would be by placing them in or near Garry’s quarters.) Watch Windows’ face as they argue about who had access to the blood. His guilt from dropping the keys and not speaking up about it is a nice touch. As for who did the deed, when Copper discovers the sabotaged blood it is still pouring out of the fridge, suggesting a very recent incident. (Contrast this to the script and novel where the blood is already
