
Revealing mistake: When Strahm's phone says "no signal" there is actually a three bar signal. (00:06:35)
Ssiscool

Continuity mistake: When Hoffman has the orange blanket put on him by the paramedic after escaping the Gideon Building, she puts it on him twice. It is also at one point not covering his right shoulder, but in the next shot, when Fisk talks to him, it is. (00:11:00)
Chosen answer: Assuming the woman in the bathtub was able to be moved safely the amount of blood gained from her, while still being helpful, would probably not be enough to save the final two survivors from self harm. Without the heart pumping blood you would only get the blood that was in her arm at the moment. You would have to lift her or raise her so gravity would get other blood moving to get enough. Which the final two possibly could have done, but stress of the situation clouded their judgement.