Stupidity: Lily dying at the end seems poetic but it would obviously cause legal trouble for Lucas and Annabel. The court/CPS would still be checking in on the girls, making sure that Lucas and Annabel were responsible guardians. There's no possible way that they could explain the disappearance of Lily. Victoria would certainly be removed from their care and there would be legal action against them, as negligent caregivers. (01:30:00 - 01:40:00)
Suggested correction: Except, of course, if Lily's body is found and her death is determined to be a tragic accident.
Her body can't be found though, because when she died, her body ceased to exist and all that was left was a butterfly.
Stupidity: Throughout the movie, and especially up on the top of the apartment building before they get rescued at the beginning of the movie, Gerry counts 12 seconds to check if someone has been infected. Just to mention this apartment example, he gets blood on his face and spends more than 12 seconds getting up and to the edge of the roof, plenty of time to become "Zeke." He then counts 12 seconds, as if they would actually matter to his infection.
