No no no- just rewatched the beginning. They ran outside and SEARCHED the sky above. They knew to look up and keep looking- it took them quite a few to see the plane. They KNEW to look up due to the "earthquake" . Not that they knew it was coming - but that the "earthquake" maybe was a malfunction in button pushing and could potentially cause the crash. Watch again- pushing that button "protected" them in a way. Remember Henry Gale talking about just going into someone else's home and taking over when he was captured. Like the button was part of them.