Question: In the flashbacks of Ransom storming out, it's different each time. The first time his Grandma speaks, the second time she's silent, and the third time she's holding cake, when she wasn't the other times. The flashbacks we see don't contradict each other, they're not really portrayed as coming from unreliable narrators, they're generally an honest portrayal of what happens, even when what they're telling the police isn't what we see happen. So why these minor, certainly deliberate, differences? Far as I'm aware it's the only time it happens too, not like there are lots of moments like this.
Question: How come Ransom did not realise that Marta had not given Harlan the morphine when he went back to the study room to switch the evidence?