Corrected entry: In the scene where Eric is driving Grandma home, he tells her it wouldn't kill her to be nice and she dies. Eric realizes this and slams on the brakes. You can see Grandma's eyes open then close before she hits the dashboard.
Corrected entry: In the scene where Kitty is making all the food because she is sad, she reaches into the oven and pulls out a tray of food. She doesn't even put on an oven mitt and she doesn't burn herself.
Correction: Many people place already prepared food in low temperature or turned off oven to keep the food warm. The oven is not at a temperature that would cause burns, so an oven mit is not necessary. Since Kitty was preparing a large amount of food, it makes sense that she would do this.
Correction: Since we see no physical injuries nor signs of pain we must assume Grandma had a fatal heart attack or stroke, neither of which would have killed her instantly - though Eric would think she had died on the spot. Obviously she dies shortly after hitting the dashboard.